Node registration fails if nova AZ value has ' '

[jichenjc]

Is this a BUG REPORT or FEATURE REQUEST?:

Uncomment only one, leave it on its own line:

/kind bug

/kind feature

What happened:

inspired by

#1364

Unable to register node "ocpcic-x45pc-master-0" with API server: Node "ocpcic-x45pc-master-0" is invalid: metadata.labels: Invalid value: "Default Group": a valid label must be an empty string or consist of alphanumeric characters, '-', '_' or '.', and must start and end with an alphanumeric character (e.g. 'MyValue',  or 'my_value',  or '12345', regex used for validation is '(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])?')

we suffered above issue with similar pattern, so I think we might consider do same thing to #1364
What you expected to happen:

How to reproduce it:

Anything else we need to know?:

Environment:

• openstack-cloud-controller-manager(or other related binary) version:
• OpenStack version:
• Others:

[jichenjc]

/assign

[jichenjc]

The issue should be related to label topology.kubernetes.io/zone

[lingxiankong]

As per discussion in #1380, it has been decided we don't solve this issue for now but add a note in the documentation.

We will come back here if we hear more feedback in the future.