[SPARK-15203][DEPLOY] The spark daemon shell script error, daemon process...

[SPARK-15203][DEPLOY] The spark daemon shell script error, daemon process start successfully but script output fail message

## What changes were proposed in this pull request?

fix the bug:
The spark daemon shell script error, daemon process start successfully but script output fail message

## How was this patch tested?

existing test.

Author: WeichenXu <WeichenXu123@outlook.com>

Closes #13172 from WeichenXu123/fix-spark-15203.

sbin/spark-daemon.sh

@@ -162,6 +162,16 @@ run_command() {
   esac
 
   echo "$newpid" > "$pid"
+  
+  #Poll for up to 5 seconds for the java process to start
+  for i in {1..10}
+  do
+    if [[ $(ps -p "$newpid" -o comm=) =~ "java" ]]; then
+       break
+    fi
+    sleep 0.5
+  done
+
   sleep 2
   # Check if the process has died; in that case we'll tail the log so the user can see
   if [[ ! $(ps -p "$newpid" -o comm=) =~ "java" ]]; then