Description of problem:

The `hammer docker --help` command returns Error output:
~~~~~~
# hammer docker --help
Error: uninitialized constant HammerCLIKatello::LifecycleEnvironmentNameResolvable
Did you mean?  HammerCLIKatello::LifecycleEnvironmentNameMapping
~~~~~~

This causes the more serious problem: I cannot get the full output from the "hammer full-help" command as it finishes with the same output.

Version-Release number of selected component (if applicable):
# rpm -q satellite
satellite-6.6.0-5.beta.el7sat.noarch

How reproducible:
Always


Steps to Reproduce:
1. Run hammer docker --help
2. Or run hammer full-help

Actual results:
Successful output

Expected results:
Error: uninitialized constant HammerCLIKatello::LifecycleEnvironmentNameResolvable
Did you mean?  HammerCLIKatello::LifecycleEnvironmentNameMapping

Additional info:
This issue is urgent for Satellite Docs because we are using the output of `hammer full-help --md` to generate the Hammer CLI guide. The new version of Hammer reference must be generated before the beta release.