NX-524: Revert KZ Timeline backport commits

Reverted commits
72105d8d85dd6d061587b38236a1a9550da4dd9b
de80c8d4af1ae5931631273cdbf57a6580b8cbf2
a17f48cc13320bd973deb71d422a1209f861561f
e70c06afee7d6a98a7bb1ec99eebc96f6da5f2db

Original PR
https://github.com/sonatype/nexus-oss/pull/550
Merge pull request #595 from sonatype/nexus-2.9.x-NX-524-revert-timeline-kz

REVIEW [2.9] NX-524: Revert KZ Timeline backport commits