Refactor tests for nodegroups to align them with dynamic dnsmasq feature

Registered by Artem Panchenko

Since automatic DHCP configuration is going to be implemented for custom node groups, we need to refactor system tests for multiple cluster networks feature:

- remove hacks for cobbler;
- change slaves bootstrap algorithm for custom nodegroups;
- configure firewall on master node to redirect TFTP traffic for custom nodegroups.

Blueprint information

Status:
Complete
Approver:
Aleksandr Didenko
Priority:
Undefined
Drafter:
Artem Panchenko
Direction:
Needs approval
Assignee:
Artem Panchenko
Definition:
Approved
Series goal:
Accepted for 8.0.x
Implementation:
Implemented
Milestone target:
milestone icon 8.0
Started by
Artem Panchenko
Completed by
Artem Panchenko

Related branches

Sprints

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Gerrit topic: https://review.openstack.org/#q,topic:bp/align-nodegroups-tests,n,z

Addressed by: https://review.openstack.org/240169
    Boot slaves after creation of custom nodegroup

Addressed by: https://review.openstack.org/239873
    Don't configure Cobbler while using nodegroups

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