Unified Rubocop cleanups under single file.

Consolidate all the .rubocop.yml into a single file, finished out cleanups for
all the Ruby files.

Change-Id: I92d5983724d5d0185cd25bea6a0f46657a6c05d4
Addresses: blueprint rubocop-for-block-storage
Remove Berksfile.lock from dev branches

blueprint remove-berksfile-lock-from-dev-branches

Change-Id: I020ca5189c3b038f0a48aab2ec35ebc00c362214