Consider SHORTNAME and shortname equal as hostname

There seems to be no reason to consider a local hostname as case
sensitive when other hostnames are compared case insensitive.

If the behavior needs to be more strict it would be good to document in
what way it is more strict.

Author: joerixaop

lib/openssl/ssl.rb

@@ -314,7 +314,7 @@ def verify_hostname(hostname, san) # :nodoc:
       san_parts = san.downcase.split(".")
 
       # TODO: this behavior should probably be more strict
-      return san == hostname if san_parts.size < 2
+      return san.downcase == hostname.downcase if san_parts.size < 2
 
       # Matching is case-insensitive.
       host_parts = hostname.downcase.split(".")