playbook: Install slapos.node from shacache

As remote repositories are unsure about it quality, rely on shacache and
use it to download and install slapos.node.

This improves quality of playbook and somehow escapes chicken and egg
problem of shacache access and required tools.

playbook/roles/repository/files/VIFIBNexedi_CentOS_7.key

+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v1.4.5 (GNU/Linux)
+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+/+6D3FndEZieHpJw/kG1eZLu/ACeKk0hcqg9zrFwj21oBr96kOBXCTs=
+=R1ai
+-----END PGP PUBLIC KEY BLOCK-----

playbook/roles/repository/tasks/main.yml

@@ -96,12 +96,10 @@
     apt_repository: repo='deb {{ base_open_build_url }}/xUbuntu_17.10/ ./' state=present
     when: ansible_distribution == "Ubuntu" and ansible_distribution_version == "17.10"
 
-  - name: Install CentOS 7 Repository
-    get_url: url=http://download.opensuse.org/repositories/home:/VIFIBnexedi/CentOS_7/home:VIFIBnexedi.repo dest=/etc/yum.repos.d/slapos.repo mode=0440
-    when: ansible_distribution == "CentOS" and ansible_distribution_major_version == "7"
-
   - name: Install CentOS 7 RPM Key
-    rpm_key: state=present key=http://download.opensuse.org/repositories/home:/VIFIBnexedi/CentOS_7/repodata/repomd.xml.key
+    # workarounded with https://github.com/marbu/ansible-modules-core-issue-1853-reproducer/commit/41727b465533717015d8d55904c5a102fe248bc4
+    # for https://github.com/ansible/ansible-modules-core/issues/1853
+    rpm_key: state=present key=roles/repository/files/VIFIBNexedi_CentOS_7.key
     when: ansible_distribution == "CentOS" and ansible_distribution_major_version == "7"
 
   - name: Install CentOS 6 Repository

playbook/roles/slapos-proxy/tasks/main.yml

@@ -20,7 +20,18 @@
 
   - name: Install re6stnet on CentOS
     yum: name=slapos.node state=present update_cache=yes
-    when: ansible_os_family == "CentOS"
+    when: ansible_distribution == "CentOS" and ansible_distribution_major_version != "7"
+
+  - name: Download slapos.node from Shacache for CentOS 7
+    get_url:
+      url: http://download.shacache.org/2ad0622eff0aa0ec3a0e8d872ca948013d216d8fc837ef0f9919290afc9372319881715764987350302172022e288d4d58f31f71980071d652d66d293533da7b
+      dest: /tmp/slapos.node-1.0.56-2.1.x86_64.rpm
+      checksum: "md5:37446cc16b38fa5769f3e084294c8683"
+    when: ansible_distribution == "CentOS" and ansible_distribution_major_version == "7"
+
+  - name: Install re6stnet on CentOS 7
+    yum: name=/tmp/slapos.node-1.0.56-2.1.x86_64.rpm state=present update_cache=yes
+    when: ansible_distribution == "CentOS" and ansible_distribution_major_version == "7"
 
   - name: Check if configuration exists already
     stat: path=/etc/opt/slapos/slapos.cfg