Fix|change system.repo update logic

- Add possibility to remove prereq. packages installation BEFORE
     * Crucial logic violation - if we don't have any repo\
       have them configured in wrong way - stage will always fail.
     * install prereq. packages after all - sounds stupid, but correct.
     * By default - it will still try to install prereq. We don't want to
       broke OLD logic.See readme, how-to overide such behaviour.
   - don't update cache per-repo - it's simply useless and may fail due p1.
     Run update only once - after all repos configured\reconfigured
   - Add new option at system:refresh_repos_meta - for case, when update
     should not be run in any case. By default - true.
   - remove 99proxies-salt-{{ name }} along with disabled repo
   - fix duplicate 'clean_file' option

Closes-Bug: PROD-15992 (PROD:15992)

Change-Id: I4b312f82f65be80e7726f62482978f68c25746a3

README.rst

                priority: 900
                package: '*'
 
+.. note:: For old ubuntu releases (<xenial)
+          extra packages for apt transport, like ``apt-transport-https``
+          may be required to be installed manually.
+          (Chicken-eggs problem: we need to install packages to
+          reach repo from where they should be installed)
+          Otherwise, you still can try 'fortune' and install prereq.packages before
+          any repo configuration, using list of requires in map.jinja.
+
+
+Disabling any prerequirment packages installation:
+You can simply drop any package pre-installation (before system.linux.repo
+will be processed) via cluster lvl:
+
+.. code-block:: yaml
+
+   linux:
+     system:
+       pkgs: ~
+
 
 Package manager proxy setup globally:
 
       system:
         purge_repos: true
 
+Refresh repositories metada, after configuration:
+
+.. code-block:: yaml
+
+    linux:
+      system:
+        refresh_repos_meta: true
+
 Setup custom apt config options:
 
 .. code-block:: yaml

linux/system/repo.sls

 {%- from "linux/map.jinja" import system with context %}
 {%- if system.enabled %}
 
+  {% if system.pkgs %}
 linux_repo_prereq_pkgs:
   pkg.installed:
   - pkgs: {{ system.pkgs }}
+  {%- endif %}
 
   # global proxy setup
   {%- if system.proxy.get('pkg', {}).get('enabled', False) %}
         {%- if repo.get('enabled', True) %}
 linux_repo_{{ name }}:
   pkgrepo.managed:
+  - refresh_db: False
+  - require_in:
+    - refresh_db
           {%- if repo.ppa is defined %}
   - ppa: {{ repo.ppa }}
           {%- else %}
   - architectures: {{ repo.architectures }}
             {%- endif %}
   - file: /etc/apt/sources.list.d/{{ name }}.list
-  - clean_file: {{ repo.clean|default(True) }}
+  - clean_file: {{ repo.get('clean_file', True) }}
             {%- if repo.key_id is defined %}
   - keyid: {{ repo.key_id }}
             {%- endif %}
   - key_url: {{ repo.key_url }}
             {%- endif %}
   - consolidate: {{ repo.get('consolidate', False) }}
-  - clean_file: {{ repo.get('clean_file', False) }}
-  - refresh_db: {{ repo.get('refresh_db', True) }}
+            {%- if repo.get('proxy', {}).get('enabled', False) or system.proxy.get('pkg', {}).get('enabled', False) or system.purge_repos|default(False) %}
   - require:
-    # FIXME remove this usless part
-    - pkg: linux_repo_prereq_pkgs
-            {%- if repo.get('proxy', {}).get('enabled', False) %}
+              {%- if repo.get('proxy', {}).get('enabled', False) %}
     - file: /etc/apt/apt.conf.d/99proxies-salt-{{ name }}
-            {%- endif %}
-            {%- if system.proxy.get('pkg', {}).get('enabled', False) %}
+              {%- endif %}
+              {%- if system.proxy.get('pkg', {}).get('enabled', False) %}
     - file: /etc/apt/apt.conf.d/99proxies-salt
-            {%- endif %}
-            {%- if system.purge_repos|default(False) %}
+              {%- endif %}
+              {%- if system.purge_repos|default(False) %}
     - file: purge_sources_list_d_repos
+              {%- endif %}
             {%- endif %}
           {%- endif %}
         {%- else %}
 linux_repo_{{ name }}_absent:
   pkgrepo.absent:
+    - refresh_db: False
+    - require_in:
+      - refresh_db
           {%- if repo.ppa is defined %}
     - ppa: {{ repo.ppa }}
             {%- if repo.key_id is defined %}
           {%- endif %}
   file.absent:
     - name: /etc/apt/sources.list.d/{{ name }}.list
+  file.absent:
+    - name: /etc/apt/apt.conf.d/99proxies-salt-{{ name }}
         {%- endif %}
-      {%- endif %} {# 1 #}
-
+      {%- endif %}
     {%- endif %}
 
   {%- if grains.os_family == "RedHat" %}
       {%- if not repo.get('default', False) %}
 linux_repo_{{ name }}:
   pkgrepo.managed:
+  - refresh_db: False
+  - require_in:
+    - refresh_db
   - name: {{ name }}
   - humanname: {{ repo.get('humanname', name) }}
         {%- if repo.mirrorlist is defined %}
   - gpgcheck: {% if repo.get('gpgcheck', False) %}1{% else %}0{% endif %}
         {%- if repo.gpgkey is defined %}
   - gpgkey: {{ repo.gpgkey }}
+          {%- endif %}
         {%- endif %}
-  - require:
-    - pkg: linux_repo_prereq_pkgs
-      {%- endif %}
-
     {%- else %}
   pkgrepo.absent:
+    - refresh_db: False
+    - require_in:
+      - refresh_db
     - name: {{ repo.source }}
     {%- endif %}
-
   {%- endif %}
-
   {%- endfor %}
 
   {%- if default_repos|length > 0 and grains.os_family == 'Debian' %}
     {%- endif %}
     - defaults:
         default_repos: {{ default_repos }}
-    - require:
-      - pkg: linux_repo_prereq_pkgs
 
-refresh_default_repo:
-  module.wait:
-    - name: pkg.refresh_db
-    - watch:
-      - file: default_repo_list
+  {%- endif %}
 
+refresh_db:
+  {%- if system.get('refresh_repos_meta', True) %}
+  module.run:
+    - name: pkg.refresh_db
+  {%- else %}
+  test.succeed_without_changes
   {%- endif %}
 
 {%- endif %}