Add service applet

The service applet is equivalent to rc-service. This was added so that
we will be more compatible with Debian and Fedora.

Reported-by: cardoe@gentoo.org
X-Gentoo-Bug: 468168
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=468168

src/rc/rc-applets.c

@@ -507,6 +507,7 @@ static const struct {
 	{ "rc-service",          rc_service,        },
 	{ "rc-status",           rc_status,         },
 	{ "rc-update",           rc_update,         },
+	{ "service",             rc_service,        },
 	{ "update-rc",           rc_update,         },
 	A(runscript),
 	{ "start-stop-daemon",   start_stop_daemon, },