Ensure 'service trafficserver stop’ is synchronous under load on redhat

Currently the service trafficserver stop command on redhat might return before ATS has exited.
This is not good as it’s often followed by a start, which then fails.

/etc/init.d/trafficserver does:

            action "Stopping ${TC_NAME}:" killproc -p $TC_PIDFILE $TC_DAEMON
            action "Stopping ${TM_NAME}:" killproc -p $TM_PIDFILE $TM_DAEMON
            action "Stopping ${TS_NAME}:" killproc -p $TS_PIDFILE $TS_DAEMON

and killproc, as defined in /etc/rc.d/init.d/functions, with those arguments essentially does this:

	send SIGTERM
	wait up to 3 seconds for it to exit
	send SIGKILL
	wait 0.1 seconds then return an exit status indicating if the process still exists

A SIGKILL signal always causes the death of a process but it’s not instantaneous. A process can take a long time to exit on a busy system for assorted reasons, including flushing dirty buffers to disk.

So if the stop is immediately followed by a start, as it often is, the start may fail with an error like ‘port 80 in use’. This seems to be a common cause of restart failures on busy systems and frustrating manual hand-holding.

Contrast this with the behaviour that /etc/init.d/trafficserver uses when run on Ubuntu… there it’ll wait up to 35 seconds.
(It'll also use SIGQUIT instead of SIGTERM which seems odd).

This PR makes /etc/init.d/trafficserver more reliable, and consistent, on redhat by adding `-d 35` to the killproc arguments so it'll wait for the daemons to stop on redhat for about as long as it does in ubuntu. Not perfect, but much better.

rc/trafficserver.in

@@ -314,9 +314,9 @@ case "$1" in
             test "x$VERBOSE" != "xno" && log_end_msg "$retval"
             exit "$retval"
         elif [ "$DISTRIB_ID" = "fedora" -o "$DISTRIB_ID" = "redhat" ]; then
-            action "Stopping ${TC_NAME}:" killproc -p $TC_PIDFILE $TC_DAEMON
-            action "Stopping ${TM_NAME}:" killproc -p $TM_PIDFILE $TM_DAEMON
-            action "Stopping ${TS_NAME}:" killproc -p $TS_PIDFILE $TS_DAEMON
+            action "Stopping ${TC_NAME}:" killproc -p $TC_PIDFILE -d 35 $TC_DAEMON
+            action "Stopping ${TM_NAME}:" killproc -p $TM_PIDFILE -d 35 $TM_DAEMON
+            action "Stopping ${TS_NAME}:" killproc -p $TS_PIDFILE -d 35 $TS_DAEMON
         elif [ "$DISTRIB_ID" = "gentoo" ]; then
 	    ebegin "Starting ${TS_PACKAGE_NAME}"
 	    do_stop