swift-drive-audit: import icehouse version

update our version of swift-drive-audit with the version from icehouse, our
changes will be imported back in the next commit to have a clean patch to send
upstream

Change-Id: Iaa1ed71033784bd22b96bd24d55e01027c755401
drive-audit: clear up exit status

Change-Id: I48df4cb32071a9e9f393b47b038dae8917be6329
Merge "swift-drive-audit: import icehouse version" into production
Merge "drive-audit: clear up exit status" into production