Allow non-empty namespaces in system uid to cancel all jobs

    private boolean cancelJobsForUid(int uid, boolean includeSourceApp,

            boolean namespaceOnly, @Nullable String namespace,

            @JobParameters.StopReason int reason, int internalReasonCode, String debugReason) {

        if (uid == Process.SYSTEM_UID) {

        // Non-null system namespace means the cancelling is limited to the namespace

        // and won't cause issues for the system at large.

        if (uid == Process.SYSTEM_UID && (!namespaceOnly || namespace == null)) {

            Slog.wtfStack(TAG, "Can't cancel all jobs for system uid");

            return false;

        }