Apache cloudstack integration for Stratos

Created two java classes in org.apache.stratos.cloud.controller component.
1. CloudstackPartitionValidator.java - implements PartitionValidator
2. CloudstackIaas.java - Extends Iaas.java

Added cloudstack dependancy to Stratos
Added cloudstack sample configuration to cloud-controller.xml


HI imesh,

I fixed those issues. By the way I think Those issues should be fixed in ec2 and openstack classes also.

Thank you.