su: allow init to automatically restart daemon

When "oneshot" is used, init will not automatically restart the
daemon. This prevents root access when the su daemon dies or is
killed.

Example of issue:
	shell@mako:/ $ su
	root@mako:/ # killall su
	Terminated
	143|shell@mako:/ $ su
	255|shell@mako:/ $

From logcat:
	D/su      ( 5542): su invoked.
	D/su      ( 5542): starting daemon client 2000 2000
	E/su      ( 5542): connect failed with 111: Connection refused

Change-Id: I15636980f1d971f7c1b2be60c650887015a7b65a
1 file changed