for Travis, this no longer is a go project

Travis insists that one picks a project language. There is no go left
in the steps executed by travis. Instead we have Python, Ruby and
shell. Let's pick the first...

Picking Python makes travis unhappy with "Can not perform a '--user'
install. User site-packages are not visible in this
virtualenv". Dropping the '--user' flag fixes that.

(cherry picked from commit 1d8d098450)

.travis.yml

@@ -1,11 +1,11 @@
-language: go
+language: python
 sudo: false
 
 env:
   - PATH="${PATH}:${HOME}/.local/bin"
 
 install:
-  - pip install --user --upgrade gsutil
+  - pip install --upgrade gsutil
   - bin/setup-ci-secrets $encrypted_5ba036e89377_key $encrypted_5ba036e89377_iv
 
 script: