Fix certificate subjects in ldap test

openssl doesn't like lower case subject attribute names. Error observed
in buildfarm results.

Backpatch to release 11.

src/test/ldap/t/001_auth.pl

@@ -102,10 +102,10 @@ mkdir $slapd_certs  or die;
 
 system_or_bail "openssl", "req", "-new", "-nodes", "-keyout",
   "$slapd_certs/ca.key", "-x509", "-out", "$slapd_certs/ca.crt", "-subj",
-  "/cn=CA";
+  "/CN=CA";
 system_or_bail "openssl", "req", "-new", "-nodes", "-keyout",
   "$slapd_certs/server.key", "-out", "$slapd_certs/server.csr", "-subj",
-  "/cn=server";
+  "/CN=server";
 system_or_bail "openssl", "x509", "-req", "-in", "$slapd_certs/server.csr",
   "-CA", "$slapd_certs/ca.crt", "-CAkey", "$slapd_certs/ca.key",
   "-CAcreateserial", "-out", "$slapd_certs/server.crt";