Fix cinder element to make volumes persistent

The element's os-refresh-config script was failing because
/var/run/cinder does not exist. It does not exist because /var/run
is usually tmpfs or cleared out before boot proceeds.

Closes-Bug: #1261403
Change-Id: Ic7042728e64159c83431c11eb1ab1bba6e7e656c
Merge "Fix cinder element to make volumes persistent"