Roll src/third_party/chromite/ c16821a44..41a52b7a1 (30 commits).
Roll src/third_party/chromite/ c16821a44..41a52b7a1 (30 commits).

https://chromium.googlesource.com/chromiumos/chromite.git/+log/c16821a44240..41a52b7a1f6a

$ git log c16821a44..41a52b7a1 --date=short --no-merges --format='%ad %ae %s'
2016-05-03 achuith Also upload VM images.
2016-05-03 cnwan Increase number of available DUTs for bvt-cq/arc-bvt-cq to match the lab.
2016-04-30 bccheng Bump up HWTest and build timeout by 30 minutes
2016-04-27 stevenjb cros_chrome_sdk: Use environemnt from --chroot
2016-04-26 stevenjb cros_best_revision: Improve logging
2016-04-29 ttsang Remove banon from experimental
2016-04-26 kevcheng chromeos_config: Add guado_labstation to x86 internal release boards.
2016-03-02 shenhan Include clang in the ChromeOS toolchain tarball - part II.
2016-04-29 gwendal portage_util: Fix regex for handling ebuild info output
2016-04-29 bccheng Revert "Bump up HWTest and build timeout by 20 minutes for cheets platform"
2016-04-28 bccheng Bump up HWTest and build timeout by 20 minutes for cheets platform
2016-04-14 nxia Set skip_duts_checking to True for canary builds from chromite
2016-04-19 victorhsieh Disable unit test on informational PFQ
2016-04-26 philipchen Remove obsolete boards
2016-04-22 cmtice [cbuildbot] Fix toolchain buildbots.
2016-04-23 bhthompson Remove lakitu_mobbuild configurations
2016-04-04 akeshet cq_stats: add some helpful README and .gitignore
2016-04-22 philipchen Add veyron_fievel to builder configuration
2016-04-22 elijahtaylor chromite: Make MD5 hashes optional for gs.py
2016-04-21 akeshet ConfigDumpStage: add a config dumping stage and run it on all builders
2016-04-20 dgarrett cros_build_lib.CreateTarball: debugging for 'file changed'.
2016-04-18 dgarrett PaygenStage: Switch to using WaitUntilReady.
2016-04-19 akeshet pre-cq: Fix incorrect link back to pre-cq builder.
2016-03-27 nxia Add auto-reboot flag in Chromite config
2016-04-18 dgarrett SigningStage: Switch to using WaitUntilReady.
2016-03-11 stevenjb Add '--report success' to build_time_stats to generate success rate stats.
2016-04-19 dgarrett compute_configs: Create new release builders in us-east1-b.
2016-04-18 nxia Repo init in repo.Sync retry
2016-04-14 bhthompson Disable manual waterfall config tests for release branches
2016-04-18 ttsang Add celes-cheets chell-cheets lulu-cheets build groups

BUG=none

Review-Url: https://codereview.chromium.org/1950753002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#391579}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk