Turn on parallelism for inspec_exec_test.rb

Seems safe after several runs.

Takes the time down from ~275s to 35s.

Signed-off-by: Ryan Davis <zenspider@chef.io>

test/functional/inspec_exec_test.rb

@@ -1,6 +1,8 @@
 require "functional/helper"
 
 describe "inspec exec" do
+  parallelize_me!
+
   include FunctionalHelper
   let(:looks_like_a_stacktrace) { %r{lib/inspec/.+\.rb:\d+:in} }