Make 'svn auth' match SSL hostnames and fingerprints case-insensitively.
Hostnames and fingerprints should have characters from the ASCII range only.

* subversion/svn/auth-cmd.c
  (match_pattern): Add 'caseblind' parameter which triggers case-insensitive
    matching.
  (match_credential): Update caller. Match SSL hostnames and fingerprints
   case-insensitively. Other credential data is matched case-sensitively.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1573701 13f79535-47bb-0310-9956-ffa450edef68