These changes make the charms.ceph library suitable for both the
old-stable Python 2 charms and the (to be) updates Python 3 only charms.
Avoided use of six by using str() with the decode('UTF-8') function to
allow the library to be used with both Py2 and Py3. The str(...)
coercions can be removed at a later date when the library no longer
needs to be synced to Py2 versions of the ceph-* charms.
Change-Id: I416053439444bf4cf8945d1fe96643f9ed0f05f4
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.