[HEAD MERGE] add multi session per UID 1 app test

Signed-off-by: David Goulet <dgoulet@efficios.com>
[MERGE] make test work

Signed-off-by: David Goulet <dgoulet@efficios.com>
[MERGE] cleanup log file on SIGINT

Signed-off-by: David Goulet <dgoulet@efficios.com>
[MERGE] fix launch test apps path

Signed-off-by: David Goulet <dgoulet@efficios.com>
[MERGE] Add readme to stress tests directory

Signed-off-by: David Goulet <dgoulet@efficios.com>