tester: Increase timeout to allow hostname propagation
tester: Increase timeout to allow hostname propagation

Some tests seem to be failing on the DigitalOcean provider because
hostnames are not yet resolvable. While not a proper solution, this
patch increases the wait time to see if the failure rate decreases.

quilt/quilt,LuiseV/quilt,NetSys/quilt,kelda/kelda,LuiseV/quilt,kayousterhout/quilt,quilt/quilt,ejj/quilt-dev,NetSys/quilt,kklin/quilt,quilt/quilt,kklin/quilt,NetSys/quilt,kklin/kelda,quilt/quilt,ejj/quilt-dev,ejj/quilt-dev,LuiseV/quilt,kklin/kelda,LuiseV/quilt,kklin/kelda,kayousterhout/quilt,NetSys/quilt,kelda/kelda,kklin/quilt,ejj/quilt-dev,kelda/kelda,kklin/quilt,kelda/kelda,kayousterhout/quilt,kayousterhout/quilt,NetSys/quilt,LuiseV/quilt,kklin/kelda