Automatic merge from submit-queue

Rewrite staging import verifier in Go
Signed-off-by: Steve Kuznetsov <skuznets@redhat.com>

**What this PR does / why we need it**:

Maintaining Bash is nobody's idea of fun. The declarative config is infinitely easier to read, as well.

**Special notes for your reviewer**:

@sttts still trying to figure out the rules you have encoded in the shell script... very confusing. Please review the `kube-gen` specifically.

**Release note**:
```release-note
NONE
```