KubernetesCluster method to delete RC was using incorrect
property and there was a typo in execution plan making it
fail on validation
Also renames destroy* methods to delete* methods to match
Kubernetes terms
Change-Id: I2ff71679deeb5ad3692fcc1a5fcfed8fa0e8d94f
Closes-Bug: #1443857
e9a04c4db0
