make bootstrap script retrieval customizable and configurable
configurable seeds for seeding
LXC revamp: unify saltcloud & lxc runners
pep8
Pylint
Take advantage of new VT code
Reinforce file markers and seed checks
Merge pull request #13480 from makinacorpus/saltshare

[Review] carefully: salt.cloud.lxc & lxc revamp for unification