MCOP-290 cope with no response

The previous implementation of find_applying_nodes would assume that a node had
completed if they didn't respond to the puppet.status action as the code was
oriented around processing the results set rather then the expected set of
responses.

With this commit we change method to operate in terms of the hosts
we expected to hear from, and count the number of times we didn't
receive a response to the status action.  If we're unresponded to
we increment the :no_response, and on exceeding the threshold we
assume that host is not coming back.