bcfg2-admin --help should display supported commands

[https://www.google.com/accounts/o8/id?id=AItOawkPb0RtPyicSdU7pLcv1UrX-yCh-YjkOwU]

bcfg2-admin --help doesn't show supported commands (modes).

Usage: bcfg2-admin [options] MODE [args]

Options:
  -h, --help            show this help message and exit
  -C FILE, --configfile=FILE
                        Path to bcfg2.conf

[rcuza]

​bcfg2-admin documentation page lists over 13 modes. Is the desired behaviour is to have bcfg2-admin -h return the same results as bcfg2-admin help? This seems reasonable and a way of shortening a person's learning curve by one command.

Proposed output:

Usage: bcfg2-admin [options] MODE [args]

Options:
  -h, --help            show this help message and exit
  -C FILE, --configfile=FILE
                        Path to bcfg2.conf

Modes:

   backup
   bundle
   client
   compare
   init
   minestruct
   perf
   pull
   query
   snapshots
   tidy
   viz
   xcmd

[https://www.google.com/accounts/o8/id?id=AItOawnSjgovXZr-_V3vGkvMSR0pc5LDykRc1Nc]

Fixed in ​https://github.com/Bcfg2/bcfg2/commit/81296e41fb0d4a056d336915103de178768d34af