Make MicroStack strictly confined, albeit in devmode for now.
Addresses unpredictable breakages with apt package upgrades in eoan
and focal, and sets the stage for a better isolated, less fragile snap
We now use layouts to handle libvirt and qemu setting paths at compile
time. This is cleaner than the organize hack.
Moved away from calls to systemctl in init, as a strictly confined
snap cannot call systemctl on a non snappy system.
Disabled call to sysctl to set ipv4_fowarding, as we don't have access
to sysctl in a strictly confined snap. This may break some users, and
we need to figure out a way to address the breakage.
Got rid of questions.shell.shell routine, moving rabbitmq setup into a
bash script instead (it's just cleaner).
Moved keypair creation into launch script, as it's difficult to do
sensible things with keypair creation in the init script, which is
running using sudo, and therefore doesn't have access to
Added (but commented out) code that will check to verify that plugs
are connected before running microstack.init or ovs-vsctl. This code
may go away entirely, as we plan on auto connecting all of our
interfaces, and don't technically need to guard against not having
Added temporary local upper-constraints file, to fix an issue where
upstream upper-constraints was breaking pip install by setting a
neutron version. This needs a better long term fix, but works for now.