[autotest] Add --check_hosts flag to run_suite.py

run_suite.py needs to support fire-and-forget test suites as well, since
we're pretty well tied to using it from the autotest_proxy_server code.

BUG=chromium-os:27522
TEST=./site_utils/run_suite.py -b x86-mario -i x86-mario-release/R19-1930.0.0-a1-b1749 -s dummy -p pool:bvt -c; # should not run a suite
TEST=./site_utils/run_suite.py -b x86-mario -i x86-mario-release/R19-1930.0.0-a1-b1749 -s dummy -p pool:bvt; # should schedule a suite
STATUS=Fixed

Change-Id: I4574d908d148d47a280b0f0acb959aa4d530da82
Reviewed-on: https://gerrit.chromium.org/gerrit/17733
Tested-by: Chris Masone <cmasone@chromium.org>
Reviewed-by: Scott Zawalski <scottz@chromium.org>
Commit-Ready: Chris Masone <cmasone@chromium.org>
1 file changed