Drop ClusterID from InstallConfig

[dgoodwin]

As discussed in arch call today and at Clayton's request, we decided we should remove the ClusterID from the InstallConfig. It should not be possible for a user to override this value and it should be generated fresh on every installer invocation.

[crawford]

Duplicate of #538.

[openshift-ci-robot]

@crawford: Closing this issue.

Details

In response to this:

Duplicate of #538.

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