Make keysetmgrservice gurantees explicit.

Add exceptions/checks for keysetmgrservice interractions which *should* never
happen, but would result in NPE or invalid metadata.  Also handle mismatches
between package and keyset metadata in packages.xml.

Bug: 20128916
Change-Id: Ia0f63f78d232d9d8d9fbe4cd8e6cc3406e5192a7
3 files changed