Remove vim headers

We don't need to have the vim headers in each source files. We can set
it in our vimrc file instead. Also if set incorrectly, gate (pep8 check)
will catch the mistakes.

More discussions:
http://lists.openstack.org/pipermail/openstack-dev/2013-October/017353.html

Change-Id: I43703e2289212389c7841f44691ae7849ed1f505
Closes-Bug: #1229324
398 files changed