dnspolicy: Add clusterID

[philbrookes]

The suggestion here is to use the UID of the kube-system namespace, as this cannot be deleted easily - so is practically speaking indelible.

We can take the UID of that namespace and apply a hashing algorithm to result in 6-7 character code which can be used as the clusterID for the local cluster.

Use as prefix to cluster specific hosts created by Kuadrant in the DNS Record.

Add to all DNS Records that Kuadrant used this in.

[maleck13]

Includes #451