Automatic merge from submit-queue (batch tested with PRs 36721, 46483, 45500, 46724, 46036)

Federation: Minor corrections in service controller and add a unit testcase

**What this PR does / why we need it**:
This PR fixes few outdated comments in federation service controller and few other minor fixes.
This also adds a unit test case to test federated service deletion.


/assign @quinton-hoole 
/cc @marun @kubernetes/sig-federation-pr-reviews 

```release-note
NONE
```