DSP-5892-2: Make kill process tree executable

DSE will start spark-submit from within another script to we only end up
reporting the process number of the spawning script. To fix this we can
kill the entire process group.

Author: RussellSpitzer

bin/kill-process-tree.sh

@@ -16,7 +16,7 @@ parent=$2
 signal=$1
 
 # A string which will be populated with descendant processes ids
-pids=""
+pids="$parent"
 
 # Kills the given process if it is running. It also checks whether the given parameter contains process ID
 function kill_if_running() {

bin/server_stop.sh

@@ -24,7 +24,7 @@ if [ ! -f "$pidFilePath" ] || ! kill -0 "$(cat "$pidFilePath")"; then
 else
   echo 'Stopping job server...'
   PID="$(cat "$pidFilePath")"
-  "$(dirname "$0")"/kill-process-tree.sh -2 $PID
+  "$(dirname "$0")"/kill-process-tree.sh 15 $PID && rm "$pidFilePath"
   echo '...job server stopped'
 fi
 

version.sbt

@@ -1 +1 @@
-version in ThisBuild := "0.5.2.DSP-5892-2-SNAPSHOT"
+version in ThisBuild := "0.5.1.155"