RFR: 8245527: LDAP Cnannel Binding support for Java GSS/Kerberos

[Alexey Bakhtin]

> I would suggest removing it. At least for the SASL GSS-API mech, it seems the GSSContext object will not be leaked and no one has a chance to call setChannelBinding again on it.
> 
> There is no spec saying setChannelBinding() can only be called once, so I'd rather we don't enforce that, although you might say there is no need to call it twice.

OK.
GSSContextImpl class is removed from patch.

Webrev : http://cr.openjdk.java.net/~abakhtin/8245527/webrev.v11

Thank you
Alexey