Adding support for apps to return PinItemRequest to launchers

as a result of Intent.ACTION_CREATE_SHORTCUT

> Adding API to allow launchers to query shortcut config activities in
  managed profiles.
> Adding API to allow the default Launcher to start the shortcut config
  activity in managed profiles.
> Updating the ACTION_CREATE_SHORTCUT documentation to represend changes
  in the expected result.

Test: Manual tests and all the unit tests
adb shell am instrument -e class com.android.server.pm.ShortcutManagerTest1 -w com.android.frameworks.servicestests
... to test10

Change-Id: I785c4f2fba782b864cc401ac7905330ea4498289