- sync charmhelpers with fix-alpha helpers
- fix up code where the alpha comparisons are done
- fix tests which assumed mocks would just work on os_release()
Change-Id: I9c0dae8a37ded6536dc2b0c53e06647f380c48b0
Related-Bug: #1659575
The charm-helpers project have re-licensed to Apache 2.0
inline with the agreed licensing approach to intefaces,
layers and charms generally.
Resync helpers to bring charmhelpers inline with charm
codebase.
Change-Id: Ia808bc55096986285bfb5d27852387be2ec416f8
