applaunch creates and deploys an auxilary script in order to collect
precise timings. This script invoked busybox with the assumption that it
is in PATH.
Since recent changes mean that it is no longer deployed to /system/bin,
the busybox in not found. With this commit, the full path to busybox
will be passed into the script's template.
When IO is heavily loaded, the impact of IO schedulers on App launch
time varies. To measure the impact, added io_stress and io_scheduler two
parameters and related jinja2 blocks.
Signed-off-by: Chase Qi <chase.qi@linaro.org>