adding rsockets support into JDK

[Chris Hegarty]

On 22/05/18 00:38, Lu, Yingqi wrote:
 > The JEP is updated with the feedback from Alan and Chris.
 >
 > https://bugs.openjdk.java.net/browse/JDK-8203434

 From the latest draft:

   "On platforms where rsocket is not supported,
    UnsupportedOperationException is thrown on socket/*channel*
    operations."

This does not sound right to me ( unless I am misinterpreting ).
I read this to mean; on platforms without RDMA support, that
openRdmaSocket() returns a Socket whose operations all throw
UnsupportedOperationException.

I would expect that openRdmaSocket() would throw
UnsupportedOperationException, if RDMA is not supported.
Similar with all the factory methods.

Also, please consider capitalizing RDMA in factory method names.

-Chris.