Bump glance_store to 0.1.9

There is an bug in glance_store https://bugs.launchpad.net/glance/+bug/1371040
which breaks glance using rbd driver, this patch updates glance_store
to >= 0.1.9 which fixes that issue.

Change-Id: I487e1b3b22e6ecbb04ff99a81f098e72e17cd842
Merge "Bump glance_store to 0.1.9"