We don't need to have the vi modelines in each source file,
it can be set in a user's vimrc if required.
Also a check is added to hacking to detect if they are re-added.
Change-Id: I347307a5145b2760c69085b6ca850d6a9137ffc6
Closes-Bug: #1229324
Creates a new vif device without attaching it to a
bridge. Quantum Linux Bridge Agent will attach the
created device to the belonging bridge.
Change-Id: I1818a92a47882d98e384b57e0fa84a0fa09d40ea