Remove use of async when compressing static files

This may be a source of CI failures, but can be reverted if found
not to be the case.

Change-Id: I4675be904a7c0577d68208e075496e31e1f7e8fe

tasks/horizon_post_install.yml

@@ -144,9 +144,6 @@
   become_user: "{{ horizon_system_user_name }}"
   changed_when: false
   notify: Restart wsgi process
-  register: async_compress_static_files
-  async: 600
-  poll: 0
 
 - name: Register DB session cleanup cron
   cron:

tasks/main.yml

@@ -87,21 +87,6 @@
   tags:
     - horizon-config
 
-# NOTE(mhayden): The async_status check here must be done as the horizon user
-# since the original task ran as that user. This task will fail if it is run
-# as root because the async status file is within the horizon user's home
-# directory, not root's home directory.
-- name: Ensure static files are compressed
-  async_status:
-    jid: "{{ async_compress_static_files.ansible_job_id }}"
-  become: yes
-  become_user: "{{ horizon_system_user_name }}"
-  register: async_compress_static_files_check
-  until: async_compress_static_files_check.finished
-  retries: 300
-  tags:
-    - horizon-config
-
 - name: Importing uwsgi/apache tasks
   import_tasks: "{{ (horizon_use_uwsgi | bool) | ternary('horizon_uwsgi.yml', 'horizon_apache.yml') }}"
   tags: