Additional Cluster Info support

[mbaldessari]

• Try and extract some more info from the underlying cluster
• Expose extra cluster info via helm variables
• Added map initialization
• Make sure we run this only when PlatformStatus is not nil

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[mbaldessari]

Really not a fan of this approach tbh. If the number of entries in extraClusterInfo[] increase we're bound to have a lot of them in the list. And we'd also need to patch common/ for this. Plus by using a simple map[string]string struct we limit ourselves for things like lists of strings (baremetal has a few of those).
I think I want to punt this until there is an actual concrete need/user for this.

[openshift-merge-robot]

PR needs rebase.

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