Rename the rc binary to openrc

Debian requested this rename due to the "rc" binary conflicting with the
"rc" binary from the plan 9 shell.

We also add a deprecation warning to the binary when it is run as rc to
encourage users to switch to openrc instead.

X-Gentoo-Bug: 493958
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=493958

sh/init-common-post.sh.in

@@ -6,7 +6,7 @@
 # the old service state data
 : ${RC_LIBEXECDIR:=@LIBEXECDIR@}
 : ${RC_SVCDIR:=@LIBEXECDIR@/init.d}
-case "$(rc --sys)" in
+case "$(openrc --sys)" in
 	OPENVZ|VSERVER)	rm -rf "$RC_SVCDIR"/*;;
 	*)		if mountinfo --quiet "$RC_SVCDIR"; then
 				rm -rf "$RC_SVCDIR"/*

sh/init.sh.Linux.in

@@ -37,7 +37,7 @@ fi
 
 # /run is a new directory for storing volatile runtime data.
 # Read more about /run at https://lwn.net/Articles/436012
-sys="$(rc --sys)"
+sys="$(openrc --sys)"
 
 if [ ! -d /run ]; then
 	if [ "$sys" = VSERVER ]; then