Add stream socket so_linger context option

[bukka]

This adds so_linger stream socket context options that is used to set the lingering time in seconds. If the value is lower or equal to 0, then the lingering is disabled.

[bukka]

The CI failure unrelated. @devnexen could you check this out if this looks good to you?

Please also check this eefbf0e if you think it's expected on FreeBSD... I suppose that it just say that it has to be greater than 0 so should be fine to leave it like that - not sure what to do else though...

[devnexen]

Please also check this eefbf0e if you think it's expected on FreeBSD... I suppose that it just say that it has to be greater than 0 so should be fine to leave it like that - not sure what to do else though...

I just double checked, but FreeBSD set l_onoff field by masking with SO_LINGER (which is 0x0080)

			l.l_onoff = so->so_options & SO_LINGER;