Description of problem:
in Messaging installation guide chapter 3.1 Setting broker options, parameter 'trace=1' is written to config file and then when launching broker by cli command, the parameter '-t' is supplied also, and it should not be, because option is already set in config file.

Version-Release number of selected component (if applicable):
2.1

Actual results:
3.1. Setting Broker Options
Setting Options Using the Configuration File
### OMMITED ###
   2.
      This example uses the configuration file to enable debug tracing. Changes will take effect from the next time the broker is started and will be used in every subsequent session.

      # Configuration file for qpidd
      trace=1

### OMMITED ###
   4.
      If you are not running the broker as a service, you can now start the broker as normal.

      # /usr/sbin/qpidd -t
      [date] [time] info Locked data directory: /var/lib/qpidd
      [date] [time] info Management enabled
      [date] [time] info Listening on port 5672


Expected results:
### OMMITED ###
   4.
      If you are not running the broker as a service, you can now start the broker as normal.

      # /usr/sbin/qpidd
      [date] [time] info Locked data directory: /var/lib/qpidd
      [date] [time] info Management enabled
      [date] [time] info Listening on port 5672


Additional info: