Disable the NumericLiterals cop for rubocop

- Disable the NumericLiterals cop in the .rubocop.yml file - this cop
  enforces an underscore '_' every 3 characters of an integer. This doesn't
  make much sense in our use case and reduces readability. Especially for port
  numbers.

Change-Id: I0eba348b7849f5fce9d758cdd44b79f589a3d4d4
Addresses: blueprint rubocop-integer