Run hack/verify-govet.sh as part of verify make target

This commit ensures that:
- go vet will be run as part of the make verify target
- the vet make-rule script won't be run directly, as generated_files won't be run in that case
- that go vet errors show up in the build log with a start time, finish time, and SUCCESS/FAILED message as part of the verify make rule script

hack/make-rules/verify.sh

@@ -25,7 +25,6 @@ source "${KUBE_ROOT}/hack/lib/util.sh"
 EXCLUDED_PATTERNS=(
   "verify-all.sh"                # this script calls the make rule and would cause a loop
   "verify-linkcheck.sh"          # runs in separate Jenkins job once per day due to high network usage
-  "verify-govet.sh"              # it has a separate make vet target
   "verify-test-owners.sh"        # TODO(rmmh): figure out how to avoid endless conflicts
   "verify-*-dockerized.sh"       # Don't run any scripts that intended to be run dockerized
   )