Starting issue #101 adding property in the GCM file.
Issue #101 added cloud properties to the GCM config file. Now we need to expose an interface to the Scaling process to load the configuration.
Issue #101 adding support in Management controller to send back the cloud properties (still to test). Next step:
1. in the scaling process: asking for the cloud properties to GCM BSON interface
2. store them
3. used them when using the openNebula API
Adding support for cloud properties in GCM property file.