Add Salt 2018.3 tests

Change-Id: Iff0423bc33b7ef5ed033653baddba2c4914367ad
diff --git a/.travis.yml b/.travis.yml
index 82d4591..52b0e80 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,19 +17,26 @@
   - bundle install
 
 env:
-
-  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2017.7 SUITE=control-default
-  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2017.7 SUITE=master-default
-  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2017.7 SUITE=minion-default
-  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2017.7 SUITE=minion-multi-master-failover
-  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2016.3 SUITE=control-default
-  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2016.3 SUITE=master-default
-  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2016.3 SUITE=minion-default
-  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2016.3 SUITE=minion-multi-master-failover
-#  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-bionic-salt-2017.7 SUITE=control-default
-#  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-bionic-salt-2017.7 SUITE=master-default
-#  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-bionic-salt-2017.7 SUITE=minion-default
-#  - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-bionic-salt-2017.7 SUITE=minion-multi-master-failover
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2016.3 SUITE=control-default
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2016.3 SUITE=master-default
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2016.3 SUITE=minion-default
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2016.3 SUITE=minion-multi-master-failover
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2017.7 SUITE=control-default
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2017.7 SUITE=master-default
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2017.7 SUITE=minion-default
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2017.7 SUITE=minion-multi-master-failover
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2018.3 SUITE=control-default
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2018.3 SUITE=master-default
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2018.3 SUITE=minion-default
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2018.3 SUITE=minion-multi-master-failover
+#  - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2017.7 SUITE=control-default
+#  - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2017.7 SUITE=master-default
+#  - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2017.7 SUITE=minion-default
+#  - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2017.7 SUITE=minion-multi-master-failover
+#  - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2018.3 SUITE=control-default
+#  - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2018.3 SUITE=master-default
+#  - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2018.3 SUITE=minion-default
+#  - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2018.3 SUITE=minion-multi-master-failover
 
 before_script:
   - set -o pipefail