Enable OSGi features for Harmony JDK

by galaxy for The Apache Software Foundation

OSGi has a lot of advantages due to its ability to manage modules' dependences and the service it provided. Apache Harmony JRE implementation has already been designed to be modularized and least coupled amongest the module . If we could integrate the two together , we will bring great flexibility to the development and update of Harmony.And more importantly this will be more attractive to users for it is more easy to use .