xbuddy: read config from default xbuddy_config.ini

If no xbuddy_config.ini is found, then read the default one stored
in devserver folder. This makes it possible to use xbuddy without
starting devserver.

TEST=Run `cros flash` which uses xbuddy directly.

Change-Id: I054eb9f164015cf42e5bef57a04bc4449dde4818
Reviewed-on: https://chromium-review.googlesource.com/228601
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Yiming Chen <yimingc@chromium.org>
Tested-by: Yiming Chen <yimingc@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
1 file changed