Issue a ``quit'' after other ppp commands given on the command line and

then wait for the connection to be closed by the peer.

This means that commands such as ``pppctl ... show links'' will
display the correct output again (rather than truncating it depending
on how much data arrived in the last packet).

usr.sbin/pppctl/pppctl.c

@@ -622,6 +622,11 @@ main(int argc, char **argv)
                     if (next)
                         start = ++next;
                 } while (next && *next);
+                if (verbose)
+                    write(1, "quit\n", 5);
+                write(fd, "quit\n", 5);
+                while (Receive(fd, verbose | REC_SHOW) == 0)
+                    ;
                 if (verbose)
                     puts("");
             }