RFR: 8297778: Modernize and improve module jdk.sctp [v5]

[Per Minborg]

On Thu, 1 Dec 2022 13:05:39 GMT, Sergey Tsypanov <stsypanov at openjdk.org> wrote:

> > receiverThread and senderThread are declared volatile but are always accessed (r/w) whilst synchronising on the stateLock.
> 

@stsypanov Yes I am aware that this was a separate observation which is not related to the assignment of the variables. I can surely keep them volatile but I wonder why they are volatile in the first place.

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PR: https://git.openjdk.org/jdk/pull/11418