Add NSG rules

[mbakunas]

Low/Medium/High level of network security Low: default NSGs only Medium: Add the following rules

• Deny inbound traffic (default)
• Allow AD DS inbound traffic from DCs hub subnet
• Allow RDP/SSH from Bastion and/or JumpHosts hub subnet
• Allow 80/443 from AppGW subnets (if deployed)
• Allow intra-subnet traffic

High: Micro-segmentation (removes the Allow intra-subnet traffic rule)

NSG rules (or placeholders) to create:

• [x] DC subnet
• [x] Jump hosts
• [x] Hub subnet 1
• [x] Hub subnet 2
• [x] Hub subnet 3
• [x] Hub subnet 4
• [x] All subnets
• [x] All hub subnets
• [x] All spoke subnets
• [x] All spoke subnet 1s
• [x] All spoke subnet 2s
• [x] All spoke subnet 3s