Create a new verifier API to extend the timeout for a giving package,
including the resulting action (allow or deny) upon the timeout occuring.
Bug: 6901038
Change-Id: I351f7944327f863aff1d7dd1227be74652fa1511
* Verifiers can be specified in the AndroidManifest.xml
* Those verifiers can respond to the new Intent action
* PackageManager API for those verifiers: verifyPendingInstall
Change-Id: I4892bce2e6984871e6e93c60a1ca0dae145f5df5