This is because the memory leak tests failed: https://travis-ci.org/github/gevent/gevent/jobs/683782800

The double-dunder name changes broke some things.

Fixes #1599

Avoid closing the same libuv watcher object twice

Under some circumstances (only seen on Windows) that could lead the program to crash.

Update libuv to 1.36

Fixes #1597

Better exception handling for alternate resolvers

A few cases of gethostbyaddr don't match the exception.

Share quite a bit more code between the ares and dnspython resolver.

Addresses #1459

The c-ares resolver comes even closer to the system resolver.

Tests pass locally on a manylinux docker image. So take it out of the known flaky list for now, see how that does.

Use `ares_getaddrinfo`

Does not yet handle canonical names, but this doesn't result in test failures.

Fixes #1588 and fixes #1589

Fixes #1567, fixes #1562, fixes #1559 and fixes #1566