only use token_file if modified within token_expire time
use time.mktime, not time.strftime
salt.modules.lxc: fix warning

/cc @mgwilliams
split tests
bypass any test for lxc virtual
LXC managment improvments

- Add functions to the module
- Introduce a new state module to manage lxc containers via salt states
salt.modules.lxc: add ip & size to infos
salt.modules.lxc: fix lxcconf gen. and add extra infos to list
salt.modules.lxc: add dns servers managment
salt.states.lxc: pep8
Adding persistence support and load for Raet Road
New test of bootstrapping Road from persisted data
add module to check existence of files/dir with path expansion
lxc: Separate more concerns and remove out of scope functions
lxc: vgname does not apply to clone
remove unnecessary check and add version info
Usage example for built-in returners

Taken from an idea expressed in #6009.
More brew module unit tests
fix for grains_cache setting on windows
pylint fixes