patching history logging and aging out

make core-service=patching:show-history return all the history (instead of the current patching state), modified the history format to patch-id, type, applied-at, make CliUtilsForPatching.rollbackAll() actually rollback all the ever applied patches, introduced PatchingHistory abstraction with the possibility to iterate over the patching history, added ageout-history handler which deletes history past the last active cp

Thanks,
Alexey