CAS-1415: Update parent pom to be at v38
CAS-1415: Updated to v39
NOJIRA: updated notice files
Modify CASImpl to make proper comparisons.  Modify CASImplTests to appropriately test.
NOJIRA: Update ldaptive to v1.0.3
NOJIRA: Verify commit messages after build
Only compare principals for mixed principal case.

Fixes failing test caused by pull #415. Add test coverage to verify mixed
principal failure case.
NOJIRA: updated notice files
[maven-release-plugin] prepare release v4.0.0-RC4
[maven-release-plugin] prepare for next development iteration