Project: talendesb
Issue TESB-1444: In OSGi make sam components configurable by the Config  Admin service
At the moment sam agent and sam server are configured by property files that have to be somewhere on the class path. In OSGi the better way is to use the config admin service which also allwos to dynamically change the properties. The sam components should be extended to take advantage of the config admin service in case they are running within OSGi and to go the traditional way when they are running in Tomcat or standalone. MAke sure the properties can be changed dynamically Also adapt the Rent a Car so that the properties are actually taken by the config admin service. The impl of the service we use in our conatiner expects the properties to be in ${container}/etc
Story points: 3