Configure git user details for kata

The kata test jobs apply patches to git repos with git. This creates
commits which requires you have a user configured in git. Set up a
global git config with generic Zuul identify info in it to address this.

More details at https://github.com/kata-containers/ci/issues/65

Change-Id: I08a6a13501fad92cd290f0a9e5559f61b11d7fab

roles/kata-setup/tasks/main.yaml

@@ -18,6 +18,13 @@
     jump: ACCEPT
   become: yes
 
+- name: Configure git user for kata patch application
+  shell: |
+    git config --global user.email "zuul@test.machine"
+    git config --global user.name "Zuul CI"
+  tags:
+    - skip_ansible_lint
+
 - name: Run kata setup.sh
   args:
     executable: /bin/bash