[Bug 1561927] Fix proposed to charm-cinder (stable/16.10)

[OpenStack Infra]

Fix proposed to branch: stable/16.10
Review: https://review.openstack.org/408050

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https://bugs.launchpad.net/bugs/1561927

Title:
  Juju 1.25.3 - infinite loop on cluster-relation-changed -
  cinder/apache services constantly restarted

Status in cinder package in Juju Charms Collection:
  Fix Committed

Bug description:
  LSB: Ubuntu 14.04.4 LTS
  openstack: cloud:trusty-liberty
  cinder packages: 2:7.0.1-0ubuntu1~cloud0
  cinder charm: lp:charms/trusty/cinder;revno=106
  Juju: 1.25.3.1
  num_units: 3
  related to hacluster charm (which remains idle)

  Symptoms:
  All three units constantly run cluster-relation-changed, causing restart of all cinder upstart jobs as well as apache2.
  If a unit is stopped, the other two stop looping. By restarting stopped unit and juju resolving it, loop starts on all three.

  Temp solution to end loop (only applied on cinder/1):
  """
  @hooks.hook('cluster-relation-changed',
              'cluster-relation-departed')
  @restart_on_change(restart_map(), stopstart=True)
  def cluster_changed():
      #check_db_initialised()
      #CONFIGS.write_all()
      pass
  """

  Such temporary solution was done at 13:08 (see attached 20160325-unit-
  cinder-1.log). Once all three units settled, I rolledback
  cluster_changed() config to original code (uncommenting
  check_db_initialised and CONFIGS.write_all), at 13:09.

  Please let me know if you need further details.

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