There has been number of failures from this test case due to the
MESH-SAE-AUTH-FAILURE event from dev[0] and dev[1] arriving couple of
seconds after the one second timeout after the dev[2] events. This does
not look like a real issue, so increase the timeout to five seconds to
make this less likely to show false failures during testing.
Signed-off-by: Jouni Malinen <j@w1.fi>