Need to support Internationalized Domain Names (IDN) in SunJSSE. Here is the known problems:
1. Endentity identification and hostname verifier problem
   Mismatch occurs if the name (Subject or SubjectAltName) in X.509 certificate contains A-labels, while the hostname in URL is Unicode encoded, and vice versa.

2. Interoperability issue for Server Name Indication (SNI) extension.
   RFC4366 allow UTF-8 hostname in SNI extension, while the revised RFC6066 only allows ASCII hostname. In JDK 7, if the target hostname in a URL is not ASCII compliant, servers follow RFC6066 may run into problems. We properly need to make improvement in JDK 7 to always sending ASCII hostname in SNI extension.