Drop KZ database, as nothing more uses it
H2 was in core as transitive dep of KZ

And some pro plugins expect it in core.
Merge pull request #627 from sonatype/drop-kazuki

REVIEW Drop KZ database, as nothing more uses it
Add public constant for siesta-based resources

Add public constant for ITs testing siesta-based REST resources
Merge branch 'master' of https://github.com/sonatype/nexus-oss
Rework scripts to pass additional flags onto Karaf, fix Windows batch files (still see warning about 'Ignoring predefined value for KARAF_HOME' but that seems to be a bug in the Karaf batch file)