Make sure aptly & builder containers catch and handle SIGTERM. Otherwise
"stx stop" sends the signal, 2 out of 6 containers ignore it, then
docker waits for ~15 seconds and SIGKILL's them.
* stx-builder.Dockerfile: change default image command from plain "bash"
to "tini" that starts "sleep infinity". Tini catches and broadcasts
signals to its own children (sleep), enabling graceful shutdown to
work
* aptly: replace call to "supervisord" to "exec supervisord", to make
sure it runs as PID 1 and actually receives signals from docker.
* stx_control.py: slightly reduce loop sleep time in "stx control stop"
TESTS
==================
* Retest "stx control start --wait"
* Make sure builder's entry point executes "finisSetup.sh" script, as
before this change
* Make sure "stx control stop --wait" exits quickly (~4 seconds on my
machine, down from ~15 seconds)
Story: 2011038
Task: 49577
Signed-off-by: Davlet Panech <davlet.panech@windriver.com>
Change-Id: I984846fc45349be045c069b84186f12179fe36ad
86d219ada7