Migrate data when apps leave sharedUserId

Add logic in installd to recursively chown the apps' internal data and
profile directory to its new app ID. In the case of an app upgrade and
the user profile unlocked, the previous appId is also passed over to
verify and only chown files that the app owns.

Bug: 179284822
Test: atest SharedUserMigrationTest#testDataMigration
Change-Id: Iee42619801aef90ac1c7849ddcbd8c08e2314547