Fix MariaDB apt package pinning

The variables in vars are only loaded when the include_vars
task is run, which is after meta-dependencies are processed.

This patch ensures that the pinning is properly applied when
the meta-dependent role is executed.

Closes-Bug: #1712315
Change-Id: Ibc7766e96e478250b5e7d4788bb56dace974d25f

defaults/main.yml

@@ -149,6 +149,9 @@ qpress_package_fallback_url: "{{ qpress_arch_fallback_url.get( galera_package_ar
 qpress_package_sha256: "{{ qpress_arch_sha256.get( galera_package_arch | lower ) }}"
 qpress_package_path: "/opt/{{ qpress_package_url | basename }}"
 
+# This is only applied if the ansible_pkg_mgr is 'apt'
+galera_server_distro_package_pins: [{ package: "*", release: MariaDB, priority: "1001" }]
+
 # Galera Server SSL functionality.
 
 galera_use_ssl: false

vars/ubuntu-16.04.yml

@@ -16,8 +16,6 @@
 ## APT Cache Options
 cache_timeout: 600
 
-galera_server_distro_package_pins: [{ package: "*", release: MariaDB, priority: "1001" }]
-
 # Galera GPG Keys
 _galera_gpg_keys:
   - key_name: 'mariadb'