1.13: backport ci fixes

[lizan]

748b2ab (mac ci: try ignoring update failure (#13658), 2020-10-20)
f95f539 (ci: various improvements (#13660), 2020-10-20)
73d78f8 (ci: use multiple stage (#13557), 2020-10-15)
b7a4756 (ci: use azp for api and go-control-plane sync (#13550), 2020-10-14)
876a6bb (ci use azp to sync filter example (#13501), 2020-10-12)
a0f31ee (ci: use azp to generate docs (#13481), 2020-10-12)
a103da9ed8 (test: fixing an integration test flake (#11845), 2020-07-01)

Signed-off-by: Lizan Zhou lizan@tetrate.io

[repokitteh-read-only]

CC @envoyproxy/dependency-shepherds: Your approval is needed for changes made to (bazel/.*repos.*\.bzl)|(bazel/dependency_imports\.bzl)|(api/bazel/.*\.bzl)|(.*/requirements\.txt)|(.*\.patch).

🐱

Caused by: #13958 was synchronize by lizan.

see: more, trace.

[antoniovicente]

CI shows a build failure because advanceTimeWait does not exist. Seems that before PR 10551 you need something like:
timeSystem().sleep(std::chrono::milliseconds(500));