Ignore _gopath in verify scripts

The _gopath directory is used in Jenkins to install extra dependencies,
and any files in it should be ignored by the various verification
scripts.

hack/lib/util.sh

@@ -241,11 +241,12 @@ kube::util::gen-analytics() {
   else
     dir="${path}"
   fi
-  # We don't touch files in Godeps|third_party, and the kubectl
+  # We don't touch files in Godeps|third_party|_gopath, and the kubectl
   # docs are autogenerated by gendocs.
   mdfiles=($( find "${dir}" -name "*.md" -type f \
               -not -path "${path}/Godeps/*" \
               -not -path "${path}/third_party/*" \
+              -not -path "${path}/_gopath/*" \
               -not -path "${path}/_output/*" \
               -not -path "${path}/docs/user-guide/kubectl/kubectl*" ))
   for f in "${mdfiles[@]}"; do