Description of problem:

  At present (Gluster 3.4.x), when someone wants to change the IP address
  or hostname for a Gluster server, they need to modify several internal
  configuration files in /var/lib/glusterd/vols/<volname>/bricks by hand.

  A utility to update these files correctly from the command line is
  worth considering, as it would reduce user error.

  Note, there's no need for the utility to communicate over the network
  itself.  We could just tell people to ensure it's run on each server
  and client node (or whatever is appropriate), then to restart GlusterFS.

Additional info:

  http://supercolony.gluster.org/pipermail/gluster-users/2014-January/038501.html