manifest: Fetch flaky git repos during repo sync

Since "repo sync" can handle flaky repositories, we add such
repositories to flaky_repos.xml (included by external_full.xml)
to avoid build failures.

Build failure logs:
https://g3c.corp.google.com/results/invocations/3e0a348a-9e97-4cf9-b558-c277c94e9dbe/targets
https://g3c.corp.google.com/results/invocations/63d7b99b-6980-4121-8b42-58898b2b41d7/targets

For revisions of the new repository, latest commit sha was used on the master branch.

BUG=b/169854365
TEST=$ mkdir flake && cd flake
     $ repo init -u /path/to/manifest-internal -b master && repo sync
     $ git -C src/platform/tast-tests/src/chromiumos/tast/remote/firmware/data/fw-testing-configs log -n 1 --pretty=format:%H
     7ed9632bfe31c5ab7f403f95194c1d8047999374
     $ git -C src/platform/tast-tests log -n 1 --pretty=format:%H
     0a0dbcc3a116a19d871ae75bed8d1a727f5b9341
     $ git -C src/platform/tast log -n 1 --pretty=format:%H
     2ad1b5ed63ac152ca9c5f907c9e093e16b14725a

Change-Id: I011999008d6f6b208f13235b98bc00134ef079f9
1 file changed
tree: aa5929510bec034f89e0673b9a0b3ae3c72284a0
  1. LICENSE
  2. PRESUBMIT.cfg
  3. README.md
  4. external_full.xml
  5. flaky_repos.xml
README.md

Manifests used to checkout COS source

Usage: repo init -u https://cos.googlesource.com/cos/manifest.git && repo sync.