Merge r1415008, r1416150 from https://svn.apache.org/repos/asf/httpd/httpd/trunk/:

PR54222: catch invalid ServerTokens args

Submitted by: Jackie Zhang  <jackie.qq.zhang gmail.com>
Reviewed/modified by: covener



Sort error message for ServerTokens by increasing verbosity. Add missing 'OS'
variant.

Remove some trailing whitespace.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1416746 13f79535-47bb-0310-9956-ffa450edef68