Add default Network Security Group for Azure VMs

The MR adds a default Network Security Group for all VMs with the exception of external HAproxy which has a custom NSG. By default Azure doesn't create NSG for VM and so it doesn't have any inbound/outbound rules. As such we need to explicitly create a default NSG for SSH access, additionally the NSG will have the default security rules.

Result Network security rules with the default NSG

Related to #121 (closed)