System Level K8s Cluster

Changes the tests and wrapper script so that a system level k8s
cluster is created instead of each test creating a new cluster.
This is needed if any parallel testing is done, due to the bug
where problems occur if more than one k8s cluster is registered
to the VIM.

Change-Id: I21cad8f2a0fe6c259a4162330b3544ceeed9309b
Signed-off-by: Mark Beierl <mark.beierl@canonical.com>