This is the start of an uber-binary that can morph into any server. Eventually we'll want this to be able to launch multiple servers from a single command line.
This makes glog flags such as --logtostderr and --alsologtostderr keep
working without requiring an explicit =true.
Tested by building kubelet and invoking it with --logtostderr. Also
tested a few non-boolean flags to ensure they weren't affected.
