Put back the gflags/gtest requirement to doc

Potential fix for race condition exposed by Node

Removes confusing/unnecessary section on generating code.

Fix race in poll() based pollset

Fix race between parsing messages and receiving status in Node client

Fix sanity

It was possible for entries in watchers[] to be deleted by another thread before we called begin_poll.

I'd like to do something nicer than this eventually... but that'll be easier once we've got the polling loop cleaned up (which is currently WIP)

Revert "Improve perf smoke test stability"

Revert "Pass a non-infinite deadline to grpc_completion_queue_next() to prevent queues from blocking indefinitely in poll()"

Revert "Pass a non-infinite deadline to grpc_completion_queue_next() to prevent queues from blocking indefinitely in poll()"

Fix leak: dont become writable if writes are closed

Simplify Node Windows tests slightly

Pass a non-infinite deadline to grpc_completion_queue_next() to prevent queues from blocking indefinitely in poll()

Simplify command that removes OpenSSL headers and remove now-extraneous
post-test script.

Improve perf smoke test stability

Revert "Properly integrate async API with server-side cancellations."

Properly integrate async API with server-side cancellations.

Revert "Ensure that no #includes are inside of a namespace."

Ensure that no #includes are inside of a namespace.