test(suse): update version to `7.0` for `opensuse-leap-15`

test/integration/default/controls/package_spec.rb

   end
 
   def test_suse
-    describe package('php5') do
+    describe package('php7') do
       it { should be_installed }
     end
   end

test/salt/pillar/suse.sls

 # -*- coding: utf-8 -*-
 # vim: ft=yaml
 ---
-php: {}
+php:
+  lookup:
+    pkgs:
+      php: php7