Minor fixes to schemas

See merge request nexedi/slapos!1031

software/cloudooo/instance-cloudooo-input-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": "object",
   "extends": "./schema-definitions.json#",
   "properties": {
     "tcpv4-port": {

software/erp5/instance-erp5-input-schema.json

 {
   "$schema": "http://json-schema.org/draft-07/schema#",
   "description": "Parameters to instantiate ERP5",
+  "type": "object",
   "additionalProperties": false,
   "definitions": {
     "routing-rule-list": {
@@ -564,7 +565,8 @@
                 "target": {
                   "description": "Target system",
                   "type": "string",
-                  "const": "selenium-server"
+                  "const": "selenium-server",
+                  "default": "selenium-server"
                 },
                 "server-url": {
                   "description": "URL of the selenium server",

software/erp5/instance-kumofs-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
   "type": "object",
-  "required": [
-    "tcpv4-port"
-  ],
   "properties": {
     "tcpv4-port": {
       "allOf": [

software/erp5/instance-smtp-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
-  "required": [
-    "tcpv4-port"
-  ],
   "type": "object",
   "properties": {
     "tcpv4-port": {

software/fluentd/instance-input-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": "object",
   "description": "Parameters to instantiate Fluentd",
   "additionalProperties": false,
   "properties": {

software/grafana/instance-input-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
   "description": "Parameters to instantiate Grafana",
+  "type": "object",
   "additionalProperties": false,
   "properties": {
     "smtp-server": {

software/jstestnode/instance-jstestnode-input-schema.json

 {
   "$schema": "http://json-schema.org/draft-07/schema#",
   "description": "Parameters to instantiate JSTestNode",
+  "type": "object",
   "additionalProperties": false,
   "required": [
     "test-suite",
@@ -63,7 +64,8 @@
             "target": {
               "description": "Target system",
               "type": "string",
-              "const": "selenium-server"
+              "const": "selenium-server",
+              "default": "selenium-server"
             },
             "server-url": {
               "description": "URL of the selenium server",
@@ -127,7 +129,8 @@
             "target": {
               "description": "Target system",
               "const": "node",
-              "type": "string"
+              "type": "string",
+              "default": "node"
             }
           }
         }

software/jupyter/instance-jupyter-input-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": "object",
   "description": "Parameters to instantiate Jupyter",
   "properties": {
     "frontend-instance-guid": {

software/monitor/instance-default-input-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": "object",
   "properties": {
     "dummy": {
       "title": "dummy",

software/neoppod/instance-neo-input-schema.json

 {
   "$schema": "http://json-schema.org/draft-07/schema#",
   "description": "Parameters to instantiate a NEO cluster. See https://lab.nexedi.com/nexedi/neoppod/blob/master/neo.conf for more information.",
+  "type": "object",
   "definitions": {
     "neo-cluster": {
       "additionalProperties": false,

software/nextcloud/nextcloud-input-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
-  "description": "Parameters to instantiate Grafana",
+  "description": "Parameters to instantiate NextCloud",
+  "type": "object",
   "additionalProperties": false,
   "properties": {
     "domain": {

software/proftpd/instance-input-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
   "description": "Parameters to instantiate ProFTPd",
+  "type": "object",
   "additionalProperties": false,
   "properties": {
     "port": {

software/pureftpd/instance-input-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
   "description": "Parameters to instantiate Pure-FTPd",
+  "type": "object",
   "additionalProperties": false,
   "properties": {
     "port": {

software/re6stnet/instance-re6stnet-input-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": "object",
   "properties": {
     "ipv6-prefix": {
       "title": "Ipv6 prefix to use to setup the new re6st network",

software/re6stnet/instance-re6stnet-slave-input-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": "object",
   "properties": {}
 }

software/slaprunner/instance-runner-input-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": "object",
   "properties": {
     "instance-name": {
       "title": "Instance Name",

software/theia/instance-input-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": "object",
   "description": "Parameters to instantiate Theia",
   "additionalProperties": false,
   "properties": {

software/varnish/instance-varnish-input-schema.json

 {
   "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": "object",
   "extends": "./schema-definitions.json#",
   "properties": {
     "tcpv4-port": {