test(pkgs_spec): simplify using match (trigger: update for suse)

* https://travis-ci.org/github/myii/salt-formula/jobs/692337807#L2366-L2381
  - `opensuse` now has `3000.3` available
* Simplification is useful anyway, even without this (could still use `case`)

test/integration/v3000-py2/controls/pkgs_spec.rb

@@ -1,21 +1,17 @@
 # frozen_string_literal: true
 
-version =
-  case platform[:family]
-  when 'debian'
-    '3000.3+ds-1'
-  end
-
 control 'salt packages' do
   title 'should be installed'
 
+  version = '3000.3'
+
   %w[
     salt-master
     salt-minion
   ].each do |p|
     describe package(p) do
       it { should be_installed }
-      its('version') { should eq version }
+      its('version') { should match(/^#{version}/) }
     end
   end
 end