Test sharing of network parameters between nodegroups

We need to check that few nodegroups could share single L2/L3 network parameters. To do that we need to prepare environment which satisfies the following requirements:

 - it has at least 10 separate networks (2 sets of adm,pub,mgmt,storage,private)
 - some of its nodes are connected to 5 networks of 1st nets set
 - some of its nodes are connected to 5 networks of 2nd nets set
 - some of its nodes are connected to 5 networks networks which belongs to both 1st and 2nd sets, for example: admin(#1), public(#1), management(#1), storage(#2), private(#1)

Test scenario draft:

Create environment.
Create 2 custom nodegroups ({custom1: [admin2, public2, mgmt2, storage2], custom2: [admin2, public2, mgmt2, storage_default]})
Bootstrap nodes from 2 nodegroups
Add nodes to environment
Assign cinder/ceph role to the node which used networks from both default and nodegroups
Assign node from previous step to 'custom2' nodegroup
Run network verification
Deploy environment
Run network verification
Run OSTF
Check that storage network on node from nodegroup #3 is configured properly