Extendable ca certs v6
Backport of https://github.com/nodejs/node/pull/9139 to v6 to resolve conflicts.
Checklist
-
make -j8 test
(UNIX), orvcbuild test nosign
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
tls,https