TESTS: suite1-main.cc: allow SIGINT to kill parallel tets session
TESTS: suite1-main.cc: allow SIGINT to kill parallel tets session

Avoid setsid() or setpgid(), so SIGINT (Ctrl-C) can kill the test server
process and all child processes.

Signed-off-by: Tim Janik <6ec6ff229c4e1c5bbd5933ee92e6c5832ff023bb@gnu.org>

swesterfeld/beast,swesterfeld/beast,tim-janik/beast,swesterfeld/beast,swesterfeld/beast,tim-janik/beast,tim-janik/beast,tim-janik/beast,swesterfeld/beast,tim-janik/beast,tim-janik/beast,swesterfeld/beast,swesterfeld/beast,tim-janik/beast