broaden error message text for htex zmq pipe errors  (#2273)
broaden error message text for htex zmq pipe errors  (#2273)

this warning is not due to a full pipe, but due to an unresponsive pipe - eg if the interchange has gone away.

rephrasing to make less confusing.
Parsl/parsl,Parsl/parsl,Parsl/parsl,Parsl/parsl