chromite: Move Timeout* functions to chromite.lib.timeout_util.

BUG=chromium:323675
CQ-DEPEND=CL:178733
TEST=cbuildbot --buildbot --debug --remote runs on x86-alex-paladin,
     x86-mario-paladin, x86-mario-release
TEST=repo grep -E \
'cros_build_lib\.(Timeout|FatalTimeout|TimeoutDecorator|'\
'WaitForCondition|WaitForReturnValue|WaitForTreeStatus|'\
'IsTreeOpen|GetTreeStatus|SubCommandTimeout|Timeout|'\
'WaitForCondition|TreeOpen)'
TEST=all unit tests

Change-Id: Ida5b3b5be04a3b891da0f0c06db832d3d01be972
Reviewed-on: https://chromium-review.googlesource.com/178734
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
Tested-by: David James <davidjames@chromium.org>
Commit-Queue: David James <davidjames@chromium.org>
20 files changed