Switch infra-ansible job to tox

The infra-ansible project has switched from in-repo
bash run_tests.sh to have tox managing venvs, deps and test commands.
As such, this change switches the Jenkins job to use the tox macro.

Depends-On: Ide54e9d4b614cc687bed293a7835d6055212f7f8
Change-Id: I7d73a4a71c23a00aa3af92d6b56eaf44a9826727

jenkins/jobs/infra.yaml

@@ -235,14 +235,13 @@
     node: 'bare-precise || bare-trusty'
 
     builders:
-      - ansible-prep
-      - ansible-lint-prep
       - revoke-sudo
       - gerrit-git-prep
-      - run-tests
+      - tox:
+          envlist: 'ansible-syntax-check'
 
     publishers:
-      - console-log
+      - zuul-swift-upload-console-log
 
 
 - job: