Dev

Implemented following:

1. Support for internal load balancer
2. Disk host caching while attaching disk
3. Support for regionwise VNet
4. Bug fix: unable to create affinity group as a part of vnet creation

Please rephrase error to look like the following:

> The VM image capture operation has been started while the VM is still running. This may cause data corruption while creating VMs from this image. Please shutdown the VM using the "azure vm shutdown" command before capturing the image.