Update staticcheck version and fix all warnings (#1381)

hack/verify-staticcheck.sh

@@ -6,12 +6,4 @@ set -o pipefail
 
 ROOT=`realpath $(dirname $0)/..`
 
-# Currently here only lists the packages that already addressed all warnings for gradual code repair.
-# That means we don't allow adding new warnings to any of package in list. And eventually, the
-# list will be replaced by find command.
-declare -a pkgs=("pkg/builder" "pkg/builder" "pkg/crd" "pkg/logger" "pkg/buildermgr" "pkg/fission-cli" "cmd/fission-cli")
-
-for pkg in "${pkgs[@]}"
-do
-    find ${ROOT}/${pkg} -type d |grep -v influxdb | xargs -I@ staticcheck @
-done
+go list ./...| grep -v vendor | grep -v "examples" | grep -v "demos" | xargs -I@ staticcheck @