Devstack apache fails to restart saying 'Address already in use'

[Vijayaguru Guruchave]

Devstack failed to start apache for Murano.

2014-08-18 10:25:01.803 | ++ restart_service apache2
2014-08-18 10:25:01.803 | ++ is_ubuntu
2014-08-18 10:25:01.803 | ++ [[ -z deb ]]
2014-08-18 10:25:01.803 | ++ '[' deb = deb ']'
2014-08-18 10:25:01.803 | ++ sudo /usr/sbin/service apache2 restart
2014-08-18 10:25:01.812 | * Restarting web server apache2
2014-08-18 10:25:02.244 | (98)Address already in use: AH00072: make_sock: could not bind to address [::]:80
2014-08-18 10:25:02.258 | (98)Address already in use: AH00072: make_sock: could not bind to address 0.0.0.0:80
2014-08-18 10:25:02.258 | no listening sockets available, shutting down
2014-08-18 10:25:02.258 | AH00015: Unable to open logs
2014-08-18 10:25:02.270 | Action 'start' failed.
2014-08-18 10:25:02.270 | The Apache error log may have more information.
2014-08-18 10:25:22.297 | ...fail!
2014-08-18 10:25:22.298 | * The apache2 instance did not start within 20 seconds. Please read the log files to discover problems

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/114969

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/114969
Committed: https://git.openstack.org/cgit/stackforge/murano/commit/?id=40b93ac0ff5f420015abf1b661935a169b45e0fc
Submitter: Jenkins
Branch: master

commit 40b93ac0ff5f420015abf1b661935a169b45e0fc
Author: Vijayaguru Guruchave <email address hidden>
Date: Mon Aug 18 18:58:27 2014 +0530

    Make apache restarts a little more forgiving

    Apache sometimes is slow to release the port which can cause restarts of apache
    to fail due to the requested port already being bound. Make use of the function
    'restart_apache_server' added to fix #1342256, which introduces a small sleep
    between the stop and start to help make apache deployments a bit more resilient.

    Closes-Bug: #1358281

    Change-Id: Ic4206f24d7bb04b014b3cb179d2303bb301c59d2