reclass: baremetal: openstack: Fix eth assignment

reclass: baremetal: openstack: Fix eth assignment

Baremetal support introduced a couple of VCP VMs, which have 2
network interfaces:
- primary (ens3 inside x86 VM) - connected to "br-mgmt" bridge on
  each kvm node, serves for MaaS DHCP / connection to salt master;
- secondary (ens4 inside x86 VM) - connected to "br-ctl" bridge on
  each kvm node, serves for Openstack Management network;

However, the reclass model was configured to use a single IP address
on the primary interface, breaking the connnection to salt master,
while also not connecting the Openstack Management network properly.

Fix this by configuring the primary interface for DHCP, while the
secondary gets a static IP in Openstack Management network.

Change-Id: I9f1d6f080e882bfaae7b5f209bc3c5536826ba06
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>