async_hooks: remove deprecated APIs
These APIs were introduced during the lifetime of Node 8 in an experimental API and should safely be removable in Node 9+.
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
async_hooks
/cc @nodejs/async_hooks