supervise: Revert "when using setsid, signal the entire process group"

This breaks services that rely on a master process doing a clean
shutdown of the children before exiting.

supervise.8.in

@@ -38,9 +38,7 @@ Unless the file
.B ./no-setsid
exists,
.B supervise
will run subordinate processes in a new process group. All signals requested by the
.BR svc (8)
program will be sent to the process group instead of the process.
will run subordinate processes in a new process group.

If
.B ./log

supervise.c

@@ -325,7 +325,6 @@ void doit(void)

    svc = &svcmain;
    killpid = svc->pid;
    if (stat_exists("no-setsid")==0) killpid = -killpid;
    while (read(fdcontrol,&ch,1) == 1)
      switch(ch) {
        case '+':
@@ -341,7 +340,6 @@ void doit(void)
        case 'l':
	  svc = &svcmain;
	  killpid = svc->pid;
	  if (stat_exists("no-setsid")==0) killpid = -killpid;
	  break;
	case 'd':
	  svc->flagwant = 1;

svc.8.in

@@ -21,15 +21,11 @@ in turn.
.TP
.B \-\=
Send all subsequent signals to the parent process instead of its
process group. This is the default when the file
.IB s/no-setsid
is present.
process group. This is the default.
.TP
.B \-\+
Send all subsequent signals to the entire process group instead of just
the parent process. This is the default unless the file
.IB s/no-setsid
is present.
the parent process.
.TP
.B \-L
Send all subsequent signals to the running