Description of problem:
pulp-admin rpm repo content errata --help says that all fields are printed by default, but they are not.

[rbarlow@limeade ~]$ pulp-admin rpm repo content errata | grep fields | tail -n 2
  --fields      - comma-separated list of resource fields. Do not include
                  spaces. Default is all fields.

An example of a field that is not included is the pkglist field.

Version-Release number of selected component (if applicable):
2.4.0-1

How reproducible:
Every time.

Steps to Reproduce:
1. Run pulp-admin rpm repo content errata --repo-id <some_repo_with_errata>

Actual results:
Observe that not all fields are included, for example, pkglist.

Expected results:
Either all fields should be included, or the --fields helptext should be adjusted to be accurate.