Maru Newby c070a3dbb5 Init default lvm volume group only if required
A recent patch [1] added support for lvm ephemeral storage for nova,
but at the cost of initializing a default lvm volume group even if it
was not required.  This change ensures that init of the default volume
group is only performed when nova and/or cinder are configured to use
lvm.

1: https://review.openstack.org/#/c/132333

Change-Id: I7634ca0ed0ffe1b13464e4d66744918f85149f2e
Closes-Bug: #1414820
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