MCOP-290 Handle case where we don't get a result from runonce

Due to client timeout we may not get a response back from our
runonce.  Handle this as though it's an old agent (we can't figure
out when it started) and return 0 from runhosti after logging that
it happened.
Merge pull request #35 from richardc/MCOP-290_cope_with_no_response

MCOP-290 Handle case where we don't get a result from runonce