Add internal subnet definitions

Change-Id: I000ad88896a2f5dd33434d11ba4e96ab7ecb6442
Firewall GitBlit HTTP port 8080 from the outside world

Change-Id: Icd6698e6fd97a009d5814b434f16be0b18f39e38
Merge "Add internal subnet definitions" into production
Merge "Firewall GitBlit HTTP port 8080 from the outside world" into production