Rework networking setup for external routers

External routers (vmx/vsrx) are now connected with accessible router
by 2 networks:
 - external control network needed to provide access to
external router via floating ip address.
 - external data network is used for mpls/gre tunnels and other
traffic.
Also added separate network for MetalLb, and is routed via infra
router.

Related-Prod: https://mirantis.jira.com/browse/PRODX-48892
Change-Id: I53d922b3a37f55453b0fc7031f835f50ca2a1a12
diff --git a/de/heat-templates/env/aio.yaml b/de/heat-templates/env/aio.yaml
index a490725..5bd98ec 100644
--- a/de/heat-templates/env/aio.yaml
+++ b/de/heat-templates/env/aio.yaml
@@ -3,6 +3,7 @@
   "MCP2::NetworkAccStorage": ../fragments/NetworkAccVMStorage.yaml
   "MCP2::NetworkPrvFl": ../fragments/NetworkPrvFl.yaml
   "MCP2::NetworkIronicFlat": ../fragments/NetworkIronicFlat.yaml
+  "MCP2::NetworkExtSrv": ../fragments/NetworkExtSrv.yaml
   "MCP2::SrvInstances": ../fragments/SrvInstancesVM.yaml
   "MCP2::SrvInstancesCeph": ../fragments/SrvInstancesVMCeph.yaml
   "MCP2::SrvInstancesCephOSD": ../fragments/SrvInstancesVMCephOSD.yaml