[18.0-fr1][openstackclient] Store hash to determine when pod spec changes #1226
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Comparing the desired pod spec to the current pod spec is not reliable as
the spec can be mutated by k8s e.g to add volume mount for a service account
or to add the default nodeselector from the namespace/cluster on OpenShift
Instead store a hash of the original pod spec and compare this to the hash
of the current desired pod spec to determine if the spec has changed.
Cherry-pick of #1211
Resolves: OSPRH-11701