fix bug in lxc runner
Merge branch 'develop' into lxc
salt.runners.lxc: speed up lxc.find_guest by returning an iterator from list_
Merge remote-tracking branch 'origin/develop' into lxc
salt.runners.lxc: move list_iter into its own function
Merge pull request #11354 from mgwilliams/lxc

salt.runners.lxc: bug and speedup