Add variable to define list of manager plugins

In order to be more flexible regarding required plugins, we implement a
new variable that will allow to set a list of enabled filters for blazar.

With that we also enable floatingip plugin that has been added to Blazar
a while ago.

Change-Id: Iaff9284eec3a57a6470afb5e912cad17970baa2f

defaults/main.yml

@@ -45,6 +45,10 @@ blazar_etc_dir: /etc/blazar
 blazar_config_option: "--config-file {{ blazar_etc_dir }}/blazar.conf"
 
 blazar_nova_aggregate_name: freepool
+blazar_manager_plugins:
+  - physical.host.plugin
+  - virtual.instance.plugin
+  - virtual.floatingip.plugin
 
 ## Common PIP requirements
 blazar_pip_packages:

releasenotes/notes/blazar_manager_plugins-73cad1d582229cc2.yaml

@@ -0,0 +1,11 @@
+---
+
+features:
+  - |
+    Implements variable ``blazar_manager_plugins`` that allows to configure
+    list of enabled plugins for Blazar.
+upgrade:
+  - |
+    Floating IP plugin for Blazar (virtual.floatingip.plugin) is now enabled
+    by default. Use ``blazar_manager_plugins`` variable to change the list of
+    enabled plugins if needed.

templates/blazar.conf.j2

@@ -32,7 +32,7 @@ driver = {{ (blazar_ceilometer_enabled | bool) | ternary('messagingv2', 'noop')
 transport_url = {{ blazar_oslomsg_notify_transport }}://{% for host in blazar_oslomsg_notify_servers.split(',') %}{{ blazar_oslomsg_notify_userid }}:{{ blazar_oslomsg_notify_password }}@{{ host }}:{{ blazar_oslomsg_notify_port }}{% if not loop.last %},{% else %}/{{ _blazar_oslomsg_notify_vhost_conf }}{% if blazar_oslomsg_notify_use_ssl | bool %}?ssl=1&ssl_version={{ blazar_oslomsg_notify_ssl_version }}&ssl_ca_file={{ blazar_oslomsg_notify_ssl_ca_file }}{% else %}?ssl=0{% endif %}{% endif %}{% endfor %}
 
 [manager]
-plugins=physical.host.plugin,virtual.instance.plugin
+plugins = {{ blazar_manager_plugins | join(',') }}
 
 [keystone_authtoken]
 auth_type = {{ blazar_keystone_auth_plugin }}