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: I19205a9bd60c0fab513703f46630d292631c72ac
Addresses: blueprint rubocop-integer

.rubocop.yml

@@ -14,6 +14,9 @@ Encoding:
       - metadata.rb
       - Gemfile
 
+NumericLiterals:
+  Enabled: false
+
 LineLength:
   Enabled: false