Signed-off-by: Kevin Albertson <kevin.albertson@mongodb.com>

Fix backport of CDRIVER-4000 to r1.17 branch.

* Sync command monitoring spec tests

This brings the spec tests up to date with mongodb/specifications#84ac002b

* Add support for 1.5 unified test format schema

This adds support for the "observeSensitiveCommands" monitoring option, as well as the new "auth" runOnRequirement.

* Redact sensitive commands for APM

* Test redaction of replies for sensitive commands

* Force redaction of replies for sensitive commands

Previously, the driver would not redact the reply to a hello command with speculative authentication unless the reply also was sensitive. As this makes the test completely useless, we've decided to always require redaction of replies when the command was redacted.

* Document is_redacted and force_redaction arguments to APM initialisers

* Make redaction helpers static

* Print correct error message when DNS resolution fails

* Drop duplicate case value

Signed-off-by: Kevin Albertson <kevin.albertson@mongodb.com>

* CDRIVER-3934 Correctly handle network errors during speculative authentication

* Assert request before getting memory failure

* Fix code review feedback

Signed-off-by: Kevin Albertson <kevin.albertson@mongodb.com>

Signed-off-by: Kevin Albertson <kevin.albertson@mongodb.com>

Signed-off-by: Kevin Albertson <kevin.albertson@mongodb.com>

Initializes pool condition variable.  Adds (non-deterministic) test for the case where a thread is waiting in call to `mongoc_client_pool_pop` for a client to become available.