Potential deadlock mitigation.

+better error logging

DataLoaders might report user statuses from lifecycle callbacks.
Immediate processing of such might introduce infinite loops/deadlocks e.g.
DataLoader_OnStop -> reportStatus(UNRECOVERABLE) -> fsmStep -> DataLoader_OnStop

Bug: 160634487
Test: atest PackageManagerShellCommandTest PackageManagerShellCommandIncrementalTest IncrementalServiceTest PackageManagerServiceTest ChecksumsTest
Change-Id: Ic68657d7a8cd6c6855b6f5295276a42b3cb09117