Occaisonally, the ceph-authtool fails to authenticate the
ceph-mon so we will perform limited retries to the authtool
call.
Change-Id: I1b44f87522a283c9e6d06064687a2330ea23e354
Partial-Bug: #1719436
Helper functions for the ceph charms. This library has shared functionality that is used in the ceph-mon, ceph-osd and ceph
charms. Anything that needs to be shared across the ceph charms should live here.