update the ossec plugin

- harmonize the coding style of the three scripts
- harmonize the label names and file names with other popular plugins
- fix active_response script to use correct date format

plugins/ossec/ossec_agents

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+if [ "$1" = "autoconf" ]; then
+	echo "yes"
+	exit 0
+fi
+
+if [ "$1" = "config" ]; then
+	echo "graph_title Ossec agents status"
+	echo "graph_args --base 1000 -l 0"
+	echo "graph_vlabel Number of ossec agents"
+	echo "graph_category ossec"
+	echo "graph_scale no"
+	echo "active.label active"
+	echo "active.draw LINE2"
+	echo 'active.min 0'
+	echo "inactive.label inactive"
+	echo "inactive.draw LINE2"
+	echo 'inactive.min 0'
+	exit 0
+fi
+
+### where to find the ossec tools
+ossecdir="/var/ossec/bin"
+
+### count the lines from the output of the list_agents tool
+ACTIVE=`$ossecdir/list_agents -c | grep -wv "** No agent available" | wc -l`
+INACTIVE=`$ossecdir/list_agents -n | grep -wv "** No agent available" | wc -l`
+
+echo "active.value ${ACTIVE}"
+echo "inactive.value ${INACTIVE}"
+exit 0