Remove attempted fix for docuploader
Remove attempted fix for docuploader

It looks like this is actually due to tar interpreting the colon in the filename unfortuantely.

However, it also looks like pip is out of date on Kokoro; this commit addresses that.

jskeet/google-cloud-dotnet,jskeet/google-cloud-dotnet,jskeet/google-cloud-dotnet,jskeet/google-cloud-dotnet,jskeet/google-cloud-dotnet,jskeet/gcloud-dotnet,googleapis/google-cloud-dotnet,googleapis/google-cloud-dotnet,googleapis/google-cloud-dotnet