container/lxc: Updates references for proxy to use device package
container/lxc: Updates references for proxy to use device package

Adds postStartHooks to startCommon.

Reduces hard coded lists of device package support checks and removes unused/moved code.

Signed-off-by: Thomas Parrott <6b778ce645fb0e3dde76d79eccad490955b1ae74@canonical.com>

hallyn/lxd,mjeanson/lxd,lxc/lxd,hallyn/lxd,hallyn/lxd,atxwebs/lxd,lxc/lxd,stgraber/lxd,mjeanson/lxd,lxc/lxd,stgraber/lxd,hallyn/lxd,atxwebs/lxd,Skarlso/lxd,stgraber/lxd,mjeanson/lxd,lxc/lxd,Skarlso/lxd,atxwebs/lxd,lxc/lxd,hallyn/lxd,Skarlso/lxd,atxwebs/lxd,lxc/lxd,stgraber/lxd,stgraber/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd,stgraber/lxd,Skarlso/lxd