New connection way to different EC2 endpoints

New connection way let us connect to other EC2 endpoints.
New params added to config are EndpointURL and optional RegionName
Example section in config:

    CloudEndpoints
    {
      EC2IFJ
      {
        driver = Amazon
        cloudDriver = Amazon
        vmPolicy = static
        vmStopPolicy = never
        maxEndpointInstances = 3
        AccessKey = xxx
        SecretKey = xxx
        EndpointURL = http://[endpoint_address]:[port]
      }
    }