Description of problem:
After a power outage, httpd doesn't come back up on the overcloud. This is the output of "systemctl status" and the output from the failed command when you run it manually:


[heat-admin@overcloud-controller-0 ~]$ systemctl status httpd.service -l
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
  Drop-In: /usr/lib/systemd/system/httpd.service.d
           └─openstack-dashboard.conf
   Active: failed (Result: exit-code) since Mon 2016-02-08 03:17:45 EST; 1h 32min ago
     Docs: man:httpd(8)
           man:apachectl(8)
  Process: 2775 ExecStartPre=/usr/bin/python /usr/share/openstack-dashboard/manage.py collectstatic --noinput --clear (code=exited, status=1/FAILURE)

[heat-admin@overcloud-controller-0 ~]$ /usr/bin/python /usr/share/openstack-dashboard/manage.py collectstatic --noinput --clear 
WARNING:root:"dashboards" and "default_dashboard" in (local_)settings is DEPRECATED now and may be unsupported in some future release. The preferred way to specify the order of dashboards and the default dashboard is the pluggable dashboard mechanism (in /usr/share/openstack-dashboard/openstack_dashboard/enabled, /usr/share/openstack-dashboard/openstack_dashboard/local/enabled).
Traceback (most recent call last):
  File "/usr/share/openstack-dashboard/manage.py", line 23, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/lib/python2.7/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
    utility.execute()
  File "/usr/lib/python2.7/site-packages/django/core/management/__init__.py", line 312, in execute
    django.setup()
  File "/usr/lib/python2.7/site-packages/django/__init__.py", line 17, in setup
    configure_logging(settings.LOGGING_CONFIG, settings.LOGGING)
  File "/usr/lib/python2.7/site-packages/django/utils/log.py", line 86, in configure_logging
    logging_config_func(logging_settings)
  File "/usr/lib64/python2.7/logging/config.py", line 803, in dictConfig
    dictConfigClass(config).configure()
  File "/usr/lib64/python2.7/logging/config.py", line 585, in configure
    '%r: %s' % (name, e))
ValueError: Unable to configure handler 'file': [Errno 13] Permission denied: '/var/log/horizon/horizon.log'


The file and the directory are owned by user apache so it should have permissions to there.


Version-Release number of selected component (if applicable):
python-django-horizon-8.0.0-8.el7ost.noarch


How reproducible:
50%. After rebooting the controller twice the problem finally was resolved, so there is a bit of randomness here.


Steps to Reproduce:
1. Reboot the overcloud


Actual results:
Apache doesn't come back up


Expected results:
The overcloud should come up immediately after a reboot