Remove vim header

No need to set tabstop tons of times, this can be set in your vimrc
file instead.

More disucssion:
http://openstack.10931.n7.nabble.com/Remove-vim-modelines-td21780.html

Change-Id: I45766d91f0c0b3622bbdc7dc5517497c87ebee8c
Closes-Bug: #1229324