Exclude frontend storage gateway from ipam

Gateway's ip can be allocated for neutron services like dhcp or
portprober.

Related-Prod: https://mirantis.jira.com/browse/PRODX-47207
Change-Id: Ie42c7b11a2d79d6f18fa900292b7627ca4db4e75
diff --git a/de/heat-templates/env/mstr1-wrkr3-cmp2-ntw3-vmx.yaml b/de/heat-templates/env/mstr1-wrkr3-cmp2-ntw3-vmx.yaml
index a922dc2..fafe70e 100644
--- a/de/heat-templates/env/mstr1-wrkr3-cmp2-ntw3-vmx.yaml
+++ b/de/heat-templates/env/mstr1-wrkr3-cmp2-ntw3-vmx.yaml
@@ -55,6 +55,8 @@
   cmps_flavor: 'mosk.s.compute.ephemeral'
   storage_frontend_network_cidr: '10.12.1.0/24'
   storage_frontend_network_gateway: '10.12.1.1'
+  storage_frontend_network_ipam_pool_start: '10.12.1.3'
+  storage_frontend_network_ipam_pool_end: '10.12.1.254'
   storage_backend_network_cidr: '10.12.0.0/24'
   hardware_metadata: |
     '00:00:00:00:00:00':