Revert "Add import of parameter IPV4_NET_EXTERNAL_PREFIX"

This reverts commit 806afd320813b5475224a662f6a9aa0dcc148900.
diff --git a/tcp_tests/templates/openstack/virtual-mcp-ocata-ovs-openstack.yaml b/tcp_tests/templates/openstack/virtual-mcp-ocata-ovs-openstack.yaml
index 0c7306e..156d8b8 100644
--- a/tcp_tests/templates/openstack/virtual-mcp-ocata-ovs-openstack.yaml
+++ b/tcp_tests/templates/openstack/virtual-mcp-ocata-ovs-openstack.yaml
@@ -1,5 +1,4 @@
 {% from 'underlay/virtual-mcp-ocata-ovs.yaml' import HOSTNAME_CFG01 with context %}
-{% from ‘salt/virtual-mcp-ocata-ovs-salt.yaml’ import IPV4_NET_EXTERNAL_PREFIX with context %}
 
 # Install OpenStack control services