Revert "multiple-pipeline: remove initial sleep and clarify second sleep

[marc-hb]

This reverts commit f93a3c8.

This broke multiple-pipeline-playback-50 on sh-tglu-sku0a3e-sdw-01 and
jf-cml-sku0983-sdw-2, see below. Almost all other platforms ran
fine.

Found by Keqiao in daily test run 3577 (thx)

It's not clear what exactly the issue/race is yet (let's discuss in
original PR #543 or in a new bug linked from there) but the top
priority is to fix the tests.

2021-04-27 22:35:17 UTC [REMOTE_COMMAND] aplay   -D hw:0,0 -c 2 -r 48000 -f S16_LE /dev/zero -q
2021-04-27 22:35:17 UTC [REMOTE_INFO] Testing: Speaker [hw:0,2]
2021-04-27 22:35:17 UTC [REMOTE_COMMAND] aplay   -D hw:0,2 -c 2 -r 48000 -f S16_LE /dev/zero -q
2021-04-27 22:35:17 UTC [REMOTE_INFO] Testing: HDMI 1 [hw:0,5]
2021-04-27 22:35:17 UTC [REMOTE_COMMAND] aplay   -D hw:0,5 -c 2 -r 48000 -f S16_LE /dev/zero -q
2021-04-27 22:35:17 UTC [REMOTE_INFO] Testing: HDMI 2 [hw:0,6]
2021-04-27 22:35:17 UTC [REMOTE_INFO] checking pipeline status
2021-04-27 22:35:17 UTC [REMOTE_COMMAND] aplay   -D hw:0,6 -c 2 -r 48000 -f S16_LE /dev/zero -q
2021-04-27 22:35:17 UTC [REMOTE_INFO] Letting playback/capture run for 5s
2021-04-27 22:35:22 UTC [REMOTE_INFO] checking pipeline status again
2021-04-27 22:35:22 UTC [REMOTE_COMMAND] pkill -9 aplay arecord
/home/ubuntu/sof-test/test-case/../case-lib/lib.sh: line 312: 59208 Killed                  aplay $SOF_ALSA_OPTS $SOF_APLAY_OPTS "$@"
/home/ubuntu/sof-test/test-case/../case-lib/lib.sh: line 312: 59216 Killed                  aplay $SOF_ALSA_OPTS $SOF_APLAY_OPTS "$@"
/home/ubuntu/sof-test/test-case/../case-lib/lib.sh: line 312: 59190 Killed                  aplay $SOF_ALSA_OPTS $SOF_APLAY_OPTS "$@"
declare -- cmd="journalctl_cmd --since=@1619562912"

2021-04-27 22:35:22 UTC [REMOTE_INFO] ===== Testing: (Loop: 2/50) =====

2021-04-27 22:35:22 UTC [REMOTE_INFO] /home/ubuntu/sof-test/test-case/multiple-pipeline.sh will use topology /lib/firmware/intel/sof-tplg/sof-tgl-rt715-rt711-rt1308-mono.tplg to run the test case
2021-04-27 22:35:22 UTC [REMOTE_INFO] Pipeline list to ignore is specified, will ignore 'pcm=HDA Digital' in test case
2021-04-27 22:35:22 UTC [REMOTE_INFO] Run command to get pipeline parameters
2021-04-27 22:35:22 UTC [REMOTE_COMMAND] sof-tplgreader.py /lib/firmware/intel/sof-tplg/sof-tgl-rt715-rt711-rt1308-mono.tplg -f 'type:playback' -b ' pcm:HDA Digital' -s 0 -e
2021-04-27 22:35:22 UTC [REMOTE_INFO] Testing: Jack Out [hw:0,0]
2021-04-27 22:35:22 UTC [REMOTE_COMMAND] aplay   -D hw:0,0 -c 2 -r 48000 -f S16_LE /dev/zero -q
2021-04-27 22:35:22 UTC [REMOTE_INFO] Testing: Speaker [hw:0,2]
2021-04-27 22:35:22 UTC [REMOTE_COMMAND] aplay   -D hw:0,2 -c 2 -r 48000 -f S16_LE /dev/zero -q
2021-04-27 22:35:22 UTC [REMOTE_INFO] Testing: HDMI 1 [hw:0,5]
2021-04-27 22:35:22 UTC [REMOTE_COMMAND] aplay   -D hw:0,5 -c 2 -r 48000 -f S16_LE /dev/zero -q
2021-04-27 22:35:22 UTC [REMOTE_INFO] Testing: HDMI 2 [hw:0,6]
2021-04-27 22:35:22 UTC [REMOTE_COMMAND] aplay   -D hw:0,6 -c 2 -r 48000 -f S16_LE /dev/zero -q
2021-04-27 22:35:22 UTC [REMOTE_INFO] checking pipeline status
2021-04-27 22:35:22 UTC [REMOTE_ERROR] Running process count is 5, but 4 is expected

[plbossart]

thanks @marc-hb I was wondering what caused these bugs, I didn't think of sof-test.

[aiChaoSONG]

@marc-hb Without the sleep, the aplay(s) started in the first iteration is not fully killed in the second iteration, wait some time before all aplay(s) disappear from ps.