Fix test_schedule_to_all_node to support installation with ironic

When OpenStack cloud is installed with Ironic using Kolla-Ansible
there will be additional "сompute" hosts named '*-ironic'.
Proposed fix removes such hosts from hosts list used to create VM

Closes-Bug: 2025604
Change-Id: I91060e0a6ee339237da982356afabba9c4451cdb
1 file changed