revisit start_rpcbind: is it necessary to configure by hand?
- some distros need to start rpcbind before
- trying to use nfs while others don't.
It seems, on its face, that it should be possible to start rpcbind only if it's not already running and avoid having to configure this per-distro. andrewschoen couldn't remember details when documenting the var, so this task is to determine whether the var is really necessary, or if we can't sense this condition automatically.