• Create Containerinfra: nodegroups Create/Update/Delete #1800
• Get / List ContainerInfra: nodegroups Get  #1774
• Update Containerinfra: nodegroups Create/Update/Delete #1800
• Delete Containerinfra: nodegroups Create/Update/Delete #1800

NodeGroup API representation:
https://github.com/openstack/magnum/blob/9c7cf5d6eb050dbbcdcb036bd0af2b6586070c0c/magnum/api/controllers/v1/nodegroup.py#L58-L127

Returned fields limited to these:
https://github.com/openstack/magnum/blob/9c7cf5d6eb050dbbcdcb036bd0af2b6586070c0c/magnum/api/controllers/v1/nodegroup.py#L147-L149

List method:
https://github.com/openstack/magnum/blob/9c7cf5d6eb050dbbcdcb036bd0af2b6586070c0c/magnum/api/controllers/v1/nodegroup.py#L226-L262

Get method:
https://github.com/openstack/magnum/blob/9c7cf5d6eb050dbbcdcb036bd0af2b6586070c0c/magnum/api/controllers/v1/nodegroup.py#L265-L280

Create method:
https://github.com/openstack/magnum/blob/9c7cf5d6eb050dbbcdcb036bd0af2b6586070c0c/magnum/api/controllers/v1/nodegroup.py#L283-L323

Available fields when creating node group:
https://github.com/openstack/python-magnumclient/blob/c0d368360831cd29affa47e77eba4e81e4c6f0f8/magnumclient/v1/nodegroups.py#L21-L23

Update method:
https://github.com/openstack/magnum/blob/9c7cf5d6eb050dbbcdcb036bd0af2b6586070c0c/magnum/api/controllers/v1/nodegroup.py#L326-L338

Delete method:
https://github.com/openstack/magnum/blob/9c7cf5d6eb050dbbcdcb036bd0af2b6586070c0c/magnum/api/controllers/v1/nodegroup.py#L341-L355