Use entries instead of list.

Fixes Rspec 4 error:
  The processes `list` property is deprecated. Please use `entries` instead.
  This property was removed in InSpec 4.0.

Author: ojongerius

controls/postgres_spec.rb

@@ -132,7 +132,7 @@
   pg_command = 'postgres'
   pg_command = 'postmaster' if os.redhat? && os.release.include?('6.')
   describe processes(pg_command) do
-    its('list.length') { should eq 1 }
+    its('entries.length') { should eq 1 }
   end
 end