start the process with it's own group and send signals to the entire process group

Signed-off-by: reggie-k <regina.voloshin@codefresh.io>

Author: reggie-k

util/exec/exec_unix.go

@@ -8,6 +8,7 @@ import "syscall"
 func newSysProcAttr(setpgid bool) *syscall.SysProcAttr {
 	return &syscall.SysProcAttr{Setpgid: setpgid}
 }
+
 func sysCallSignal(pid int, sig syscall.Signal) error {
 	return syscall.Kill(pid, sig)
 }