Ignore PredicateName Rubocop cop

This obfuscates whether `something?` is a "is-a" or a "has-a"
relationship.

Change-Id: Ibddb6ae0e071643452d9197bf8e23aa08d5c1fed
Reviewed-on: http://gerrit.causes.com/36706
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>