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: Id34d182bd1804072e11c26fd5e426c3be18b1847
Avoid use of 'service --status-all' which is currently
broken on trusty for upstart managed daemons; the change
moves to detecting how the daemon is managed, and then
using upstart status XXX or the return code of service XXX
status to determine whether a process is running.
Fixes for IPv6 network address detection under Ubuntu
16.04 which changes the output format of the ip commands
slightly.
Update the version map to include 8.1.x as a Neutron
version for Mitaka.
Change-Id: Id7fbde876f717aba34374815cdc36eb477857817
Closes-Bug: 1581171
Closes-Bug: 1581598
Closes-Bug: 1580674
Corey Bryant