Description of problem:

Cannot specify a timeout when trying to open a connection

Version-Release number of selected component (if applicable):

python-qpid 0.10

How reproducible:

everytime

Steps to Reproduce:
1. Try opening a connection to a broker that does not exist 
  
Actual results:
Connection just hangs forever

Expected results:
The ability to specify a timeout

Additional info:

Looking through this qpid.messaging.endpoints code I noticed this on line 261.

  self._ewait(lambda: self._transport_connected and not self._unlinked())

It never seems to pass the timeout kwarg to _ewait that has the following signiture:

  def _ewait(self, predicate, timeout=None)