[FIXED JENKINS-11744] Debian/Ubuntu init script does not wait long enough during stop operation

Increase stop timeout from 5 to 20 seconds.

changelog.html

@@ -76,6 +76,9 @@ Upcoming changes</a>
   <li class=bug>
     Fixed a bug in Windows registry enumeration with large data.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-11767">issue 11767</a>)
+  <li class=bug>
+    Debian/Ubuntu init script does not wait long enough during stop operation
+    (<a href="https://issues.jenkins-ci.org/browse/JENKINS-11744">issue 11744</a>)
 </ul>
 </div><!--=TRUNK-END=-->
 

debian/debian/jenkins.init

@@ -147,7 +147,7 @@ do_stop()
 	0) 
 	    $DAEMON $DAEMON_ARGS --stop || return 2
         # wait for the process to really terminate
-        for n in 1 2 3 4 5; do
+        for n in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20; do
             sleep 1
             $DAEMON $DAEMON_ARGS --running || break
         done