mongo: Ping wait for mongo peers before running
mongo: Ping wait for mongo peers before running

Mongo DB was still dying due to the network not being fully
configured at the time it was initialized.  This patch temporarily
resolves the issue by adding a ping wait.

kelda/kelda,tejasmanohar/quilt,stevenlin598/quilt,stevenlin598/quilt,ejj/quilt-dev,tejasmanohar/quilt,mmussomele/quilt,LuiseV/quilt,tejasmanohar/quilt,quilt/quilt,kklin/quilt,PenguinToast/quilt,stevenlin598/quilt,NetSys/quilt,mmussomele/quilt,kelda/kelda,PenguinToast/quilt,NetSys/quilt,stevenlin598/quilt,kklin/kelda,kklin/quilt,mmussomele/quilt,kklin/quilt,kklin/kelda,PenguinToast/quilt,LuiseV/quilt,ejj/quilt-dev,kklin/kelda,quilt/quilt,stevenlin598/quilt,stevenlin598/quilt,LuiseV/quilt,NetSys/quilt,mmussomele/quilt,mmussomele/quilt,quilt/quilt,NetSys/quilt,LuiseV/quilt,kklin/quilt,kklin/kelda,kelda/kelda,PenguinToast/quilt,kelda/kelda,ejj/quilt-dev,kayousterhout/quilt,quilt/quilt,tejasmanohar/quilt,ejj/quilt-dev,NetSys/quilt,kayousterhout/quilt,kayousterhout/quilt,kayousterhout/quilt,PenguinToast/quilt,mmussomele/quilt,LuiseV/quilt