Add Salt 2018.3 tests and update test pillar

Change-Id: I91c8894200ff97a6ef8f5e1c0e5829f84e3e2412
diff --git a/.kitchen.yml b/.kitchen.yml
index 12347a1..658fe92 100644
--- a/.kitchen.yml
+++ b/.kitchen.yml
@@ -37,7 +37,7 @@
 platforms:
   - name: <%=ENV['PLATFORM'] ||  'saltstack-ubuntu-xenial-salt-stable' %>
     driver_config:
-      image: <%=ENV['PLATFORM'] || 'epcim/salt-formulas:saltstack-ubuntu-xenial-salt-stable'%>
+      image: <%=ENV['PLATFORM'] || 'epcim/salt:saltstack-ubuntu-xenial-salt-stable'%>
       platform: ubuntu
 
 suites:
diff --git a/.travis.yml b/.travis.yml
index 1741991..ff701f6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,9 +17,16 @@
   - bundle install
 
 env:
-    - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2016.3 SUITE=client-single
-    - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2017.7 SUITE=client-single
-#     - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-bionic-salt-2017.7 SUITE=client-single
+    - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2016.3 SUITE=client-single
+    - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2016.3 SUITE=server-single
+    - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2017.7 SUITE=client-single
+    - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2017.7 SUITE=server-single
+    - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2018.3 SUITE=client-single
+    - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2018.3 SUITE=server-single
+#    - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2017.7 SUITE=client-single
+#    - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2017.7 SUITE=server-single
+#    - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2018.3 SUITE=client-single
+#    - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2018.3 SUITE=server-single
 
 before_script:
   - set -o pipefail
diff --git a/tests/pillar/client_single.sls b/tests/pillar/client_single.sls
index 87507ec..dbd4d8a 100644
--- a/tests/pillar/client_single.sls
+++ b/tests/pillar/client_single.sls
@@ -9,6 +9,11 @@
 linux:
   system:
     enabled: true
+    group:
+      jdoe:
+        enabled: true
+        name: jdoe
+        system: true
     user:
       jdoe:
         enabled: true