packer: Make all builds works in headless mode by default.

packer/centos-6.7-testing-version.json

@@ -28,7 +28,7 @@
             "ssh_wait_timeout": "1800s",
             "shutdown_command": "sudo poweroff",
 
-            "headless": false,
+            "headless": true,
             "boot_wait": "2s",
             "boot_command": [
               "<esc>",

packer/centos-6.7-vm-boostrap.json

@@ -28,7 +28,7 @@
             "ssh_wait_timeout": "1800s",
             "shutdown_command": "sudo poweroff",
 
-            "headless": false,
+            "headless": true,
             "boot_wait": "2s",
             "boot_command": [
               "<esc>",

packer/centos-6.7.json

@@ -28,7 +28,7 @@
             "ssh_wait_timeout": "1800s",
             "shutdown_command": "sudo poweroff",
 
-            "headless": false,
+            "headless": true,
             "boot_wait": "2s",
             "boot_command": [
               "<esc>",

packer/centos-7.2-testing-version.json

@@ -28,7 +28,7 @@
             "ssh_wait_timeout": "1800s",
             "shutdown_command": "sudo poweroff",
 
-            "headless": false,
+            "headless": true,
             "boot_wait": "2s",
             "boot_command": [
               "<esc>",

packer/centos-7.2-vm-bootstrap.json

@@ -27,7 +27,7 @@
             "ssh_wait_timeout": "1800s",
             "shutdown_command": "sudo poweroff",
 
-            "headless": false,
+            "headless": true,
             "boot_wait": "2s",
             "boot_command": [
               "<esc>",

packer/centos-7.2.json

@@ -28,7 +28,7 @@
             "ssh_wait_timeout": "1800s",
             "shutdown_command": "sudo poweroff",
 
-            "headless": false,
+            "headless": true,
             "boot_wait": "2s",
             "boot_command": [
               "<esc>",

packer/debian7-testing-version.json

@@ -27,7 +27,7 @@
             "ssh_wait_timeout": "1800s",
             "shutdown_command": "echo '{{user `password`}}'|sudo -S shutdown -h now",
 
-            "headless": false,
+            "headless": true,
             "boot_wait": "2s",
             "boot_command": [
                    "<esc><wait><wait>",

packer/debian7-vm-bootstrap.json

@@ -27,7 +27,7 @@
             "ssh_wait_timeout": "1800s",
             "shutdown_command": "echo '{{user `password`}}'|sudo -S shutdown -h now",
 
-            "headless": false,
+            "headless": true,
             "boot_wait": "2s",
             "boot_command": [
                    "<esc><wait><wait>",

packer/debian7.json

@@ -27,7 +27,7 @@
             "ssh_wait_timeout": "1800s",
             "shutdown_command": "echo '{{user `password`}}'|sudo -S shutdown -h now",
 
-            "headless": false,
+            "headless": true,
             "boot_wait": "2s",
             "boot_command": [
                    "<esc><wait><wait>",

packer/debian8-erp5-standalone.json

@@ -27,7 +27,7 @@
             "ssh_wait_timeout": "1800s",
             "shutdown_command": "echo '{{user `password`}}'|sudo -S shutdown -h now",
 
-            "headless": false,
+            "headless": true,
             "boot_wait": "2s",
             "boot_command": [
                    "<esc><wait><wait>",

packer/debian8-testing-version.json

@@ -27,7 +27,7 @@
             "ssh_wait_timeout": "1800s",
             "shutdown_command": "echo '{{user `password`}}'|sudo -S shutdown -h now",
 
-            "headless": false,
+            "headless": true,
             "boot_wait": "2s",
             "boot_command": [
                    "<esc><wait><wait>",

packer/debian8-vm-boostrap.json

@@ -27,7 +27,7 @@
             "ssh_wait_timeout": "1800s",
             "shutdown_command": "echo '{{user `password`}}'|sudo -S shutdown -h now",
 
-            "headless": false,
+            "headless": true,
             "boot_wait": "2s",
             "boot_command": [
                    "<esc><wait><wait>",

packer/debian8-webrunner-standalone.json

@@ -27,7 +27,7 @@
             "ssh_wait_timeout": "1800s",
             "shutdown_command": "echo '{{user `password`}}'|sudo -S shutdown -h now",
 
-            "headless": false,
+            "headless": true,
             "boot_wait": "2s",
             "boot_command": [
                    "<esc><wait><wait>",

packer/debian8-wendelin-standalone.json

@@ -27,7 +27,7 @@
             "ssh_wait_timeout": "1800s",
             "shutdown_command": "echo '{{user `password`}}'|sudo -S shutdown -h now",
 
-            "headless": false,
+            "headless": true,
             "boot_wait": "2s",
             "boot_command": [
                    "<esc><wait><wait>",

packer/debian8.json

@@ -27,7 +27,7 @@
             "ssh_wait_timeout": "1800s",
             "shutdown_command": "echo '{{user `password`}}'|sudo -S shutdown -h now",
 
-            "headless": false,
+            "headless": true,
             "boot_wait": "2s",
             "boot_command": [
                    "<esc><wait><wait>",

packer/ubuntu-14.04-server-amd64-testing-version.json

@@ -14,7 +14,7 @@
             "format": "qcow2",
             "accelerator": "kvm",
             "disk_size": "{{ user `disk_size`}}",
-
+            "headless": true,
             "iso_url": "http://releases.ubuntu.com/14.04/ubuntu-14.04.4-server-amd64.iso",
             "iso_checksum": "2ac1f3e0de626e54d05065d6f549fa3a",
             "iso_checksum_type": "md5",

packer/ubuntu-14.04-server-amd64-vm-bootstrap.json

@@ -14,6 +14,7 @@
             "format": "qcow2",
             "accelerator": "kvm",
             "disk_size": "{{ user `disk_size`}}",
+            "headless": true,
 
             "iso_url": "http://releases.ubuntu.com/14.04/ubuntu-14.04.4-server-amd64.iso",
             "iso_checksum": "2ac1f3e0de626e54d05065d6f549fa3a",

packer/ubuntu-14.04-server-amd64.json

@@ -14,7 +14,7 @@
             "format": "qcow2",
             "accelerator": "kvm",
             "disk_size": "{{ user `disk_size`}}",
-
+            "headless": true,
             "iso_url": "http://releases.ubuntu.com/14.04/ubuntu-14.04.4-server-amd64.iso",
             "iso_checksum": "2ac1f3e0de626e54d05065d6f549fa3a",
             "iso_checksum_type": "md5",

packer/ubuntu-15.04-server-amd64-testing-version.json

@@ -15,6 +15,7 @@
             "accelerator": "kvm",
             "disk_size": "{{ user `disk_size`}}",
 
+            "headless": true,
             "iso_url": "http://releases.ubuntu.com/15.04/ubuntu-15.04-server-amd64.iso",
             "iso_checksum": "487f4a81f22f8597503db3d51a1b502e",
             "iso_checksum_type": "md5",

packer/ubuntu-15.04-server-amd64.json

@@ -14,7 +14,7 @@
             "format": "qcow2",
             "accelerator": "kvm",
             "disk_size": "{{ user `disk_size`}}",
-
+            "headless": true,
             "iso_url": "http://releases.ubuntu.com/15.04/ubuntu-15.04-server-amd64.iso",
             "iso_checksum": "487f4a81f22f8597503db3d51a1b502e",
             "iso_checksum_type": "md5",