Fix include matcher behavior

rspec-expectations recently released v3.13.2, which includes a change to
the include matcher (see rspec/rspec-expectations@bd5d306).

This change breaks using the splat operator on an array into the include
matcher.

This commit updates the matcher to iterate over the array instead of
using the splat operator.

(cherry picked from commit 8e49889)

spec/integration/parser/collection_spec.rb

@@ -8,7 +8,7 @@ def expect_the_message_to_be(expected_messages, code, node = Puppet::Node.new('t
     catalog = compile_to_catalog(code, node)
     messages = catalog.resources.find_all { |resource| resource.type == 'Notify' }.
                                  collect { |notify| notify[:message] }
-    expect(messages).to include(*expected_messages)
+    expected_messages.each { |message| expect(messages).to include(message) }
   end
 
   def warnings