Add template option for the default horizon panel

The change adds the option to set the default panel within horizon.
this change is useful when a tenant has many hundreds of vms and
running into horizon login slowness due to poorly crafted api
calls and sql statements.

Change-Id: If3da12a466d4953a176ec8e45499bf1cd9452ae5
Closes-Bug: #1533830
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

defaults/main.yml

@@ -128,6 +128,9 @@ horizon_enable_neutron_lbaas: False
 ## Swift
 horizon_swift_file_transfer_chunk_size: 524288
 
+## Panel
+horizon_default_panel: overview
+
 horizon_webroot: /
 
 horizon_listen_ports:

tasks/horizon_post_install.yml

@@ -42,6 +42,7 @@
   with_items:
     - { src: "horizon_local_settings.py.j2", dest: "/etc/horizon/local_settings.py", mode: "0644" }
     - { src: "horizon-manage.py.j2", dest: "{{ horizon_bin }}/horizon-manage.py", mode: "0755" }
+    - { src: "80_admin_default_panel.py.j2", dest: "{{ horizon_lib_dir }}/openstack_dashboard/local/enabled/_80_admin_default_panel.py", mode: "0755" }
   notify: Restart apache2
   tags:
     - horizon-configs

tasks/horizon_pre_install.yml

@@ -164,6 +164,7 @@
     - { path: "{{ horizon_lib_dir }}/static", mode: "2755" }
     - { path: "{{ horizon_lib_dir }}/openstack_dashboard", mode: "2755" }
     - { path: "{{ horizon_lib_dir }}/openstack_dashboard/local", mode: "2755" }
+    - { path: "{{ horizon_lib_dir }}/openstack_dashboard/local/enabled", mode: "2755" }
   tags:
     - horizon-dirs
 

templates/80_admin_default_panel.py.j2

@@ -0,0 +1,4 @@
+PANEL = '{{ horizon_default_panel }}'
+PANEL_DASHBOARD = 'admin'
+PANEL_GROUP = 'admin'
+DEFAULT_PANEL = '{{ horizon_default_panel }}'