Windows Server Core Unknown Windows Features

[mfortin]

Describe the Issue
Fax and TFTP-Client are not available on Windows Server 2019 Core

Expected Behavior
A clear and concise description of what you expected to happen.

Actual Behavior

TASK [Windows-2019-STIG : MEDIUM | WN19-00-000320 | PATCH | Windows Server 2019 must not have the Fax Server role installed.] ***
fatal: [10.0.0.78]: FAILED! => changed=false
  msg: 'Failed to uninstall Windows Feature: ArgumentNotValid: The role, role service, or feature name is not valid: ''Fax''. The name was not found.'

TASK [Windows-2019-STIG : MEDIUM | WN19-00-000370 | PATCH | Windows Server 2019 must not have the TFTP Client installed.] ***
    fatal: [10.0.0.78]: FAILED! => changed=false
     msg: 'Failed to uninstall Windows Feature: ArgumentNotValid: The role, role service, or feature name is not valid: ''TFTP-Client''. The name was not found.'

Control(s) Affected

• WN19-00-000320
• WN19-00-000370

Environment (please complete the following information):

• branch being used: devel
• Ansible Version: 2.16
• Host Python Version: python 3.7
• Ansible Server Python Version: python 3.7
• Additional Details:

Additional Notes
Anything additional goes here

Possible Solution
Skip step if Windows Server Core is detected