Session IDs are an implementation detail that the framework can (and should)
abstract away. This was previously reverted due to breaking master.
Test: adb shell am instrument -w -e package
com.android.server.locksettings.recoverablekeystore
com.android.frameworks.servicestests/android.support.test.runner.AndroidJUnitRunner
Change-Id: I4427c818348c054ada39d799b6da3b739f27eba9