Bug 14953

mtrace command on the cli has redundancy.
When asked to show the output in brief, the "detail" should not appear in the possible completion set.
The brief/detail commands should be exclusive


kvugane@dope> mtrace from-source source 10.6.0.1 group 224.0.1.40 brief ?  
Possible completions:
  <[Enter]>            Execute this command
  detail               Display detailed output
  extra-hops           Extra hops to try past a non-responding router (0..255)
  interval             Interval between statistics gathering (seconds)
  loop                 Loop indefinitely, print rate and loss statistics
  max-hops             Maximum hops to trace toward source (0..255)
  max-queries          Maximum number of query attempts for any hop (1..32)
  multicast-response   Always request the response using multicast
  no-resolve           Don't attempt to print addresses symbolically
  no-router-alert      Don't use the router-alert IP option
  response             Send trace response to host or multicast address
  ttl                  IP time-to-live value (0..255)
  unicast-response     Always request the response using unicast
  wait-time            Time to wait for a response (seconds)
  |                    Pipe through a command