Allow override of the repo filename

Apt cannot have 2 mirrors with the same content in 2 different files.
If a deployer has an apt mirror with mariadb (and others), the deployer
still need to add a repository, but will also need to define the
filename used, in order to avoid clashes.

This commit makes possible to decide the filename for the repo.

Change-Id: Ic83d464512f6f8697e520d79520dcf21370f8beb
Signed-off-by: Jean-Philippe Evrard <jean-philippe.evrard@rackspace.co.uk>

defaults/main.yml

@@ -37,3 +37,5 @@ galera_client_fatal_deprecations: false
 
 ## Tunable overrides
 galera_client_my_cnf_overrides: {}
+
+mariadb_repo_filename: "MariaDB"

releasenotes/notes/apt-source-filenamed-9718897bcfa7b36b.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - The filename of the apt/yum source can now be
+    defined with the variable ``mariadb_repo_filename``.

tasks/galera_client_install_apt.yml

@@ -58,7 +58,7 @@
 # statically named apt sources file.
 - name: Find old sources
   command: >
-    grep -rnil maria /etc/apt/sources.list.d/ --exclude MariaDB.list
+    grep -rnil maria /etc/apt/sources.list.d/ --exclude {{ mariadb_repo_filename }}.list
   changed_when: false
   failed_when: false
   register: old_sources
@@ -84,7 +84,7 @@
 - name: Add galera repo
   apt_repository:
     repo: "{{ galera_client_repo }}"
-    filename: MariaDB
+    filename: "{{ mariadb_repo_filename }}"
     state: present
     update_cache: yes
   register: add_repo

vars/redhat-7.yml

@@ -18,7 +18,7 @@ galera_client_repo:
   state: "present"
   name: MariaDB
   description: "MariaDB Repo"
-  file: MariaDB
+  file: "{{ mariadb_repo_filename }}"
   baseurl: "{{ galera_client_yum_repo_url }}"
   gpgkey: "http://yum.mariadb.org/RPM-GPG-KEY-MariaDB"