Have spec .rubocop.yml inherit from config in root directory
Have spec .rubocop.yml inherit from config in root directory

We want the root directory config to still apply inside this directory.

Change-Id: Ibe757086b1685811cc388c1488cd6f963993a10c

diffux/diffux,kalw/diffux,diffux/diffux,kalw/diffux,kalw/diffux,diffux/diffux