Leave a symlink when to at /var/lib/cinder

When registering /var/lib/cinder as a state-path leave a symlink
to avoid cinder (installed from package) trying to recreate the
directory(which it doesn't have permission todo).

Change-Id: Ia14882c7a761687db69a1335c280302ac2d04c97
Merge "Leave a symlink when to at /var/lib/cinder"