parameterize debian init startup timeout

defaults/main.yml

@@ -32,6 +32,7 @@ es_xpack_features: ["alerting","monitoring","graph","ml","security"]
 #They do not effect the current configuration
 es_api_host: "localhost"
 es_api_port: 9200
+es_debian_startup_timeout: 10
 
 # Since ansible 2.2 the following variables need to be defined
 # to allow the role to be conditionally played with a when condition.

templates/init/debian/elasticsearch.j2

@@ -165,7 +165,7 @@ case "$1" in
 	return=$?
 	if [ $return -eq 0 ]; then
 		i=0
-		timeout=10
+		timeout={{es_debian_startup_timeout}}
 		# Wait for the process to be properly started before exiting
 		until { kill -0 `cat "$PID_FILE"`; } >/dev/null 2>&1
 		do