Drop testing of SaltStack 2016.3

Change-Id: I598afaf5e661fc915e3c9a5d98e02f20388b103a
Related: PROD-27314 (PROD:27314)
diff --git a/.kitchen.yml b/.kitchen.yml
index 20c7df1..a7929c6 100644
--- a/.kitchen.yml
+++ b/.kitchen.yml
@@ -43,7 +43,6 @@
   sudo: true
 
 docker_images:
-  - &xenial-20163 <%=ENV['IMAGE_XENIAL_20163'] || 'docker-dev-local.docker.mirantis.net/epcim/salt/saltstack-ubuntu-xenial-salt-2016.3/salt:2018_11_19'%>
   - &xenial-20177 <%=ENV['IMAGE_XENIAL_20177'] || 'docker-dev-local.docker.mirantis.net/epcim/salt/saltstack-ubuntu-xenial-salt-2017.7/salt:2018_11_19'%>
   - &xenial-stable <%=ENV['IMAGE_XENIAL_STABLE'] || 'docker-dev-local.docker.mirantis.net/epcim/salt/saltstack-ubuntu-xenial-salt-stable/salt:2018_11_19'%>