Separate testing of content from gem on travis-ci
Separate testing of content from gem on travis-ci

MSP-12456

Testing non-content takes ~2m20s locally while the full tests take
~13 minutes on travis-ci, so try separating content and non-content
tests first.  If this doesn't lower the overall run time enough, the
content tests will be split more by module type.

rapid7/metasploit-cache,rapid7/metasploit-cache,rapid7/metasploit-cache,rapid7/metasploit-cache