This commit integrates functionality from the
`openstack.common.report` module into Cinder.
This enables Cinder services to receive SIGUSR1
and print a Guru Meditation Report to stderr.
The required modules were added to
'openstack-common.conf' as well.
It is essentially a copy from implementation of
nova side.
Change-Id: I5bbdc0f97db9b0ebd7b48e50ab7869e2ca33aead
Implements: blueprint guru-meditation-report
f2dc050e4d