[8u-dev] RFR: 8036979: Support java.net.SocketOption<> in java.net socket types

[Alan Bateman]

Reflection or shared secrets is a coin toss here, I think what you have 
is okay. An alternative name for the package private class in java.net 
is SocketSecrets, just a suggestion as SocketsUtil sounds more general 
that it is.

I agree with Chris on throwing InternalError if any of the reflection 
code fails as that would indicate a bug or build issue somewhere.

jdk.net.Sockets mostly look good. I guess I would avoid _ in variable 
names but they are private so minor. Some of line lengths are a bit long 
in the method declaration. Not a big deal but they might have future 
side-by-side reviews harder.

Looks like "{" has ended up on the wrong line in a few places, 
NetworkPermission for example, a few other classes too.

ExtendedOptionsImpl.<clinit> could use a lambda I assume.

ExtendedOptionsImpl.c L95 - alignment?

I don't have any other comments beyond the comments on the 9 version.

-Alan