[autotest] Fix default path for servo-switch mapping file.
This is to fix the path of the servo-switch mapping file in
utils.py, frontend_server.py and rpm_dispatcher.py.
They now use full path to open the file.
BUG=chromium:251878
TEST=run frontend_server and rpm_dispatcher locally; and run unittests
in rpm_control_system directory.
Change-Id: I19d6fb1c3c2c4e0f27336e10fc815039a6eb969b
Reviewed-on: https://gerrit.chromium.org/gerrit/59298
Reviewed-by: Simran Basi <sbasi@chromium.org>
Commit-Queue: Fang Deng <fdeng@chromium.org>
Tested-by: Fang Deng <fdeng@chromium.org>
3 files changed