- renamed ctdb_control utility to ctdb

- renamed ctdb_control utility to ctdb

- use -n to specify node number in ctdb utility

- change 'ctdb status' to 'ctdb statistics'

- added 'ctdb status' which shows status

- added netmask to public IPs, so you don't try a takeover on a
  foreign network

- cleaned up tools/ctdb_control.c a lot

- generate usage message at runtime