Use code-generator to generate clientset/informer/lister (#1492)

To reduce maintenance effort and avoid writing duplicate informer code,
use code-generator to generate clientset/informer/lister code.

hack/verify-govet.sh

@@ -4,4 +4,4 @@ set -o errexit
 set -o nounset
 set -o pipefail
 
-go vet -v $(go list ./...| grep -v "vendor" | grep -v "examples" | grep -v "demos" | grep -v "test")
+go vet -v $(go list ./...| grep -v "vendor" | grep -v "examples" | grep -v "genclient" | grep -v "demos" | grep -v "test")

hack/verify-staticcheck.sh

@@ -4,4 +4,4 @@ set -o errexit
 set -o nounset
 set -o pipefail
 
-go list ./...| grep -v vendor | grep -v "examples" | grep -v "demos" | grep -v "test" | xargs -I@ staticcheck @
+go list ./...| grep -v vendor | grep -v "examples" | grep -v "demos" | grep -v "genclient" | grep -v "test" | xargs -I@ staticcheck @