dns/knot-resolver: Fix service status

Add status() function to rc script.

PR:		266320
Reported by:	yonas.yanfa@gmail.com
Approved by:	freebsd@dns.company (maintainer, timeout > 1 month)

dns/knot-resolver/files/kresd.in

@@ -62,4 +62,14 @@ kresd_stop() {
 	fi
 	}
 
+kresd_status() {
+    if [ -e "${pidfile}" ]; then
+        echo "${name} is running on pid $(cat $pidfile)."
+        return 1
+    else
+        echo "${name} is not running."
+        return 0
+    fi
+}
+
 run_rc_command "$1"