Merge pull request #1863 from ekohl/fix-tmpfile

Add extension parameter to parent tmpfile method signature

lib/beaker/host.rb

@@ -544,7 +544,7 @@ def do_rsync_to from_path, to_path, opts = {}
       raise Beaker::Host::CommandFailure, result.error
     end
 
-    def tmpfile(name = '')
+    def tmpfile(name = '', extension = nil)
       raise NotImplementedError
     end