Initial rubocop support.

Per the mailing list thread, introducing Rubocop as a replacement for Tailor.
Assuming Jenkins likes this, more pedantic patches will follow to make Rubocop
happy.

Change-Id: I20623ba0efbda5e305cefd10fdced57790343706
Adding 2 rubocop configuration files

Keeping in accordance with the other projects, adding a few standard
settings for rubocop. Dont check line lengths, dont check for UTF-8
comments and dont suggest word arrays for attributes files.

Change-Id: I62a04e7a34f9cd9020caa1dff96b6fa38db807cd