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: I2b37758f9dbb2cad6457a879d4ed7ff0aa69ef8e
Partial-Bug: #1229324