[SPARK-5825] [Spark Submit] Remove the double checking instance name when stopping the service

`spark-daemon.sh` will confirm the process id by fuzzy matching the class name while stopping the service, however, it will fail if the java process arguments is very long (greater than 4096 characters).
This PR looses the check for the service process.

Author: Cheng Hao <hao.cheng@intel.com>

Closes #4611 from chenghao-intel/stopping_service and squashes the following commits:

a0051f6 [Cheng Hao] loosen the process checking while stopping a service

sbin/spark-daemon.sh

@@ -166,7 +166,7 @@ case $option in
 
     if [ -f $pid ]; then
       TARGET_ID="$(cat "$pid")"
-      if [[ $(ps -p "$TARGET_ID" -o args=) =~ $command ]]; then
+      if [[ $(ps -p "$TARGET_ID" -o comm=) =~ "java" ]]; then
         echo "stopping $command"
         kill "$TARGET_ID"
       else