Allow disabling SO_LINGER on java.net.Socket

[Sanne]

Fixes ##1087

I'm a Red Hat employee so I believe I won't need to sign an individual contributor agreement.

It's my first contribution. Please let me know if I should do anything else; I'm wondering also if I should add a regression test? I could use a pointer to an example of how you want such tests structured.

Thanks!

[graalvmbot]

Hello Sanne Grinovero, thanks for contributing a PR to our project!

We use the Oracle Contributor Agreement to make the copyright of contributions clear. We don't have a record of you having signed this yet, based on your email address sanne -(at)- hibernate -(dot)- org. You can sign it at that link.

If you think you've already signed it, please comment below and we'll check.

[Sanne]

@graalvmbot I'm a Red Hat employee so I believe I won't need to sign an individual contributor agreement.

[cstancu]

@Sanne I updated the OCA signatory list with your email.

[Sanne]

thanks @cstancu !

[graalvmbot]

Sanne Grinovero has signed the Oracle Contributor Agreement (based on email address sanne -(at)- hibernate -(dot)- org) so can contribute to this repository.

[Sanne]

pushed an improved commit, after feedback on #1087