Initial rubocop support for ChefSpec tests.

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. So far this is just spacing issues and adding UTF-8 headers, but more
work will need to be done to remove all of the changes for the .rubocop-todo.yml

Addresses: blueprint rubocop-for-block-storage
Change-Id: Ibb11739e452016c101995a371d031faeeb7e7683
Merge "Initial rubocop support for ChefSpec tests."