examples/init.d: fix web.listen-address flag (#1157)

CLI flags use two dashes instead of one since v0.15.0
Also, use default port number
Fixes #1156

Signed-off-by: Paul Gier <pgier@redhat.com>

examples/init.d/node_exporter

@@ -4,7 +4,7 @@ RETVAL=0
 PROG="node_exporter"
 EXEC="/etc/node_exporter/node_exporter"
 LOCKFILE="/var/lock/subsys/$PROG"
-OPTIONS="-web.listen-address=:9201"
+OPTIONS="--web.listen-address=:9100"
 
 # Source function library.
 if [ -f /etc/rc.d/init.d/functions ]; then