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: I9ab9a5d8801536e68e3ee672be0cc9accdb5fd9a
Add charmhelpers.contrib.hardening and calls to install,
config-changed, upgrade-charm and update-status hooks. Also
add new config option to allow one or more hardening
modules to be applied at runtime.
Change-Id: Ic417d678d3b0f7bfda5b393628a67297d7e79107
Billy Olsen