Description of problem:

In config edit UI, input invalid keystone authentication settings, these invalid settings can pass configuration validation. 

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

quay 3.8.0 
quay 3.7.9

How reproducible:

always

Steps to Reproduce:
1. deploy quay 3.8.0 or 3.7.9
2. access config edit UI
3. choose "Keystone (OpenStack Identity)" in Internal Authentication section
4. Input invalid keystone information

Actual results:

These invalid settings can pass configuration validation. 

Expected results:

The invalid keystone settings can NOT pass configuration validation.