Fix pom to exclude javassist 3.11.0.GA for test scope to work
Fix pom to exclude javassist 3.11.0.GA for test scope to work

that version is bundled as a transitive dependency which causes
powermock to fail we need the 3.20.0-GA version for PowerMock to work so
it needs to be explicitly included and 3.11.0.GA is optional to be
excluded.
blackducksoftware/hub-bamboo,blackducksoftware/hub-bamboo,blackducksoftware/hub-bamboo