LocalDrive fails fast on P devices

Makes LocalDrive quit for devices running P or earlier; the
statsd of such devices lack the --keep_data flag and therefore will
fail anyway, so we may as well the user why and fail fast.

Test: Manual testing on userdebug and userbuild, P and Q
Change-Id: Ia26528383c9d35732ffd819ed2e2ac6f3bb41b34