The current snaps now have well-known aliases defined at install time
for commands [1]. This means we can drop the manual alias definition
from snapcraft.yaml and the instructions for setting it up.
When building/installing locally users can still create the alias
with 'snap alias'.
[1] https://forum.snapcraft.io/t/auto-aliases-for-openstack-base-snaps/1146/6
Change-Id: Ib34183ded789775fa76d701bd78a168bccb5fa08
The following are included in the switch to strict confinement:
* Set snapcraft.yaml confinement to strict and restore/update plugs
* Drop building of python as it's not required for strict snaps
* Switch back to running apps under root
Change-Id: I4704cac75230df5514ce42cdd6cde2b7ad9ed9b3
Enable the ability for default config files to be overridden.
Also refresh the README while documenting how default config files can
be overridden.
Change-Id: I792475bd20adda2626bbf3775924a21c811df15e