test(amazonlinux): match package version against os

Author: noelmcloughlin

test/integration/v201902-py2/controls/pkgs_spec.rb

@@ -9,6 +9,10 @@
   when 'debian'
     '2019.2.3+ds-1'
   end
+  case platform[:os]
+  when 'amazonlinux'
+    '2019.2.3-1.el7'
+  end
 
 control 'salt packages' do
   title 'should be installed'