Fix Python version for Travis CI tests
Remove unnecessary group declaration causing conflicting IDs

Change-Id: I4efffcabd0abb20e9374ff1a236a6dc50ad4fb9a
diff --git a/.travis.yml b/.travis.yml
index ff701f6..0abbcea 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,6 @@
+language: python
+python:
+- "2.7.13"
 sudo: required
 services:
   - docker
diff --git a/tests/pillar/client_single.sls b/tests/pillar/client_single.sls
index dbd4d8a..87507ec 100644
--- a/tests/pillar/client_single.sls
+++ b/tests/pillar/client_single.sls
@@ -9,11 +9,6 @@
 linux:
   system:
     enabled: true
-    group:
-      jdoe:
-        enabled: true
-        name: jdoe
-        system: true
     user:
       jdoe:
         enabled: true