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: I20f9ea0c108a2e3849c5f9cfa5a074550af0a12f
Add support for OpenStack Newton and Ocata.
Rework version detection code to just match on major version for
OpenStack projects using semantic versioning.
Provide fallback version detection based on major.minor versions
for swift packages.
Rework config-flags support helpers.
Fix is_ip function to correctly detect both IPv4 and IPv6 addresses.
Change-Id: If6416eec20d6c00eafd1f68f65ef7b2a810584b8