Added a list of possible interfaces for which the
vagrant provisioner will choose the first one that
is available. No more editing the test recipes.
Cleaned up the os selection to hide the
version specific stuff to be consistent with the
environment logic.
Fixed up some file modes.
Forced the chef client config directory as it can search
in bad places in some scenarios.
Change-Id: I38a7a86b58893b912af99fabf04ca9052f914346
7fd2cde5a4