rc.subr: svcj - let svcj_all_enable enable service jails

Fix the logic for svcj_all_enable.

Fixes:		2efbd480f1 rc: add service jails framework
MFC after:	1 week
MFC to:		stable/15

libexec/rc/rc.conf

@@ -766,6 +766,8 @@ jail_confwarn="YES"	# Prevent warning about obsolete per-jail configuration
 jail_parallel_start="NO"	# Start jails in the background
 jail_list=""		# Space separated list of names of jails
 jail_reverse_stop="NO"	# Stop jails in reverse order
+svcj_all_enable="NO"	# Run all services in a service jail unless
+						# they are explicitly excluded
 
 ##############################################################
 ### Define source_rc_confs, the mechanism used by /etc/rc.* ##

libexec/rc/rc.subr

@@ -1172,8 +1172,9 @@ run_rc_command()
 	if [ -z "$_svcj" ]; then
 		_svcj=${svcj_all_enable}
 		if [ -z "$_svcj" ]; then
-			eval ${name}_svcj=NO
+			_svcj=NO
 		fi
+		eval ${name}_svcj=$_svcj
 	fi
 
 					# setup pid check command