Description of problem:
These no command to delete an exposed service, even if this service was exposed using "virtctl expose".
virtcrl should have a delete command, just like there's "oc expose" and "oc delete svc".


Version-Release number of selected component (if applicable):
Server/client: v0.12.0-alpha.2


How reproducible:
Always.


Steps to Reproduce:
1. Create a cirros VM.
 # oc create -f cluster/example/vm-cirros.yaml
2. Start the VM:
 # virtctl start vm-cirros
3. Verify VMI is running.
 # oc get VMI
NAME            AGE       PHASE     IP            NODENAME
vm-cirros       10m       Running   10.130.0.46   cnv-executor-ysegev-node1.example.com
4. Expose a service using "virtctl expose", e.g. a service of type NodePort:
 # virtctl expose vmi vm-cirros --name=testnp --port=27017 --target-port=22 --type=NodePort


Actual results:
In order to delete the exposed service, you have to run "oc delete svc".


Expected results:
It makes sense, that just like "oc expose" has a complementary "oc delete svc", there should also be a complementary "virtctl delete svc".

Additional info: