Description of problem:
remediating with the DISA STIG does not properly change the gdm login screen message. 

Version-Release number of selected component (if applicable):
openscap-1.2.17-2.el7.x86_64
scap-security-guide-0.1.40-12.el7.noarch

How reproducible:
Always

Steps to Reproduce:
1. Install a system with server with GUI
2. Install scap-security-guide and scap-workbench
3. Run a customization on scap-workbench using DISA STIG to ensure that openscap does not remove x11 packages. 
4. Remediate the system using that customization created in step 3

Actual results:
gdm login screen is not updated to show the login warning message

Expected results:
gdm login screen should show the login warning:

================================================================================ 

You are accessing a U.S. Government (USG) Information System (IS) that is 
provided for USG-authorized use only. By using this IS (which includes any 
device attached to this IS), you consent to the following conditions:

-The USG routinely intercepts and monitors communications on this IS for 
purposes including, but not limited to, penetration testing, COMSEC monitoring, 
network operations and defense, personnel misconduct (PM), law enforcement 
(LE), and counterintelligence (CI) investigations.

-At any time, the USG may inspect and seize data stored on this IS.

-Communications using, or data stored on, this IS are not private, are subject 
to routine monitoring, interception, and search, and may be disclosed or used 
for any USG-authorized purpose.

-This IS includes security measures (e.g., authentication and access controls) 
to protect USG interests--not for your personal benefit or privacy.

-Notwithstanding the above, using this IS does not constitute consent to PM, LE 
or CI investigative searching or monitoring of the content of privileged 
communications, or work product, related to personal representation or services 
by attorneys, psychotherapists, or clergy, and their assistants. Such 
communications and work product are private and confidential. See User 
Agreement for details.

================================================================================

Additional info:

The message does get added to the "banner-message-text" config option in '/etc/dconf/db/gdm.d/00-security-settings'. 

Also, logging in via ssh/console does present the user with the login warning (since it gets properly set in /etc/issue), it appears to just be an issue with the gdm banner not properly displaying.