gitlab-ci: Add more logs to api test

In order to debug or analize issue with api test
it would be good to have more logs. With this patch
we can collect logs from supervisord and wifimngr.
Collection of those logs were added to test artifacts.

Sometimes it happened that api tests were started
but wifimngr process was not RUNNING yet. This
is handled by waiting loop till wifimngr process is
in RUNNING state. After that ubus-api-validator is called.

Signed-off-by: Marek Puzyniak <marek.puzyniak@iopsys.eu>