Disable mongos on travis

Added more minor debug logging for the individual replicaset nodes.
Update the test to use the server data from the context

This fixes the test on travis as it may not have consistent hostname
PHP 5.2 doesn't support namespaces
Merged Pull Request #426

* pull-request/426:
  PHP 5.2 doesn't support namespaces
  Update the test to use the server data from the context
  Disable mongos on travis