Description of problem:
TAB completion for pulp-admin doesn't return short options

How reproducible:
always


Steps to Reproduce:
>> pulp-admin -u admin -p admin rpm repo list --
--all      --details  --fields   --help     --summary  
>> pulp-admin -u admin -p admin rpm repo list --help
Command: list
Description: lists repositories on the Pulp server

Available Arguments:

  --summary, -s - if specified, a condensed view with just the repository ID and
                  name is displayed
  --details     - if specified, detailed configuration information is displayed
                  for each repository
  --fields      - comma-separated list of repository fields; if specified, only
                  the given fields will displayed
  --all, -a     - if specified, information on all Pulp repositories, regardless
                  of type, will be displayed
>> pulp-admin -u admin -p admin rpm repo list -s[TAB][TAB]
... nothing here


Expected results:
>> pulp-admin -u admin -p admin rpm repo list -[TAB][TAB]
-a --all      --details  --fields   --help  -s   --summary