Nova-lxd requires that our Ceph images only contain the features
supported by the kernel RBD driver, and a discussion on the dev mailing
list suggests that 1 should work fine as the driver level
This commit contains a charmhelpers sync to bring in the new
flag to support configuration sent from the ceph charms.
Change-Id: Ifb20000fb8ec7c54e752fdb3acdc16043637a81d