Fix "gem count" integrity test

The bouncy-castle-java gem is no longer bundled, but the integrity tests are still counting it.  Update the test to expect the now-correct count of 7 bundled gems.

This moves `oraclejdk8 TARGET='-Pdist'`, `oraclejdk7 TARGET='-Pjruby-jars'`, `oraclejdk7 TARGET='-Pmain'`, and `oraclejdk8 TARGET='-Pcomplete'` from red to green on Travis (see [here](https://travis-ci.org/dmarcotte/jruby/builds/27794864))

Note: after this change, these tests will fail locally until you `mvn clean` at the root and also in `maven/jruby-dist` and `maven/jruby-stdlib`