Optimize kitchen tests for Travis CI and fix test repo

Change-Id: I33fbc3b28f573936f0eb003bdfab9233e7c0cb76
diff --git a/tests/pillar/repo_influxdata.sls b/tests/pillar/repo_influxdata.sls
index 012a7ae..3c8f522 100644
--- a/tests/pillar/repo_influxdata.sls
+++ b/tests/pillar/repo_influxdata.sls
@@ -3,6 +3,7 @@
     enabled: true
     repo:
       linux_influxdata:
-        source: "deb http://repos-backend.influxdata.com/ubuntu {{ grains.get('oscodename') }} stable"
+        source: "deb http://repos.influxdata.com/ubuntu {{ grains.get('oscodename') }} stable"
         architectures: amd64
-        key_url: "http://repos-backend.influxdata.com/influxdb.key"
+        # key_url: "http://repos.influxdata.com/influxdb.key"
+        # https repo not working - see https://github.com/influxdata/influxdb/issues/9199 for more info