[autotest] Add --retry option to run_suite

Pipe the retry configuration ->frontend->suite control files.
This allows us to enable/disable retry for each suite run.

The next step is to update all the suite control files to
pipe 'job_retry' to dynamic suite which will be done in CL:200308

TEST=unittest;
locally run a suite with and without the option, observe
tests were retried/not retried.
1) ./run_suite.py --build trybot-lumpy-release/R37-5858.0.0-b2105
--suite_name dummy --board lumpy --retry=True
2)./run_suite.py --build trybot-lumpy-release/R37-5858.0.0-b2105
--suite_name dummy --board lumpy
BUG=chromium:373929
DEPLOY=apache

Change-Id: I2c8c9caf36fd2132d75bd381e015d0adfddda34f
Reviewed-on: https://chromium-review.googlesource.com/200223
Reviewed-by: Fang Deng <fdeng@chromium.org>
Commit-Queue: Fang Deng <fdeng@chromium.org>
Tested-by: Fang Deng <fdeng@chromium.org>
3 files changed