KAFKA-10272: Add IBM i support to "stop" scripts (#9023)

Reviewers: Mickael Maison <mickael.maison@gmail.com>

bin/kafka-server-stop.sh

@@ -15,11 +15,14 @@
 # limitations under the License.
 SIGNAL=${SIGNAL:-TERM}
 
-if [[ $(uname -s) == "OS/390" ]]; then
+OSNAME=$(uname -s)
+if [[ "$OSNAME" == "OS/390" ]]; then
     if [ -z $JOBNAME ]; then
         JOBNAME="KAFKSTRT"
     fi
     PIDS=$(ps -A -o pid,jobname,comm | grep -i $JOBNAME | grep java | grep -v grep | awk '{print $1}')
+elif [[ "$OSNAME" == "OS400" ]]; then
+    PIDS=$(ps -af | grep -i 'kafka\.Kafka' | grep java | grep -v grep | awk '{print $2}')
 else
     PIDS=$(ps ax | grep -i 'kafka\.Kafka' | grep java | grep -v grep | awk '{print $1}')
 fi

bin/zookeeper-server-stop.sh

@@ -15,11 +15,14 @@
 # limitations under the License.
 SIGNAL=${SIGNAL:-TERM}
 
-if [[ $(uname -s) == "OS/390" ]]; then
+OSNAME=$(uname -s)
+if [[ "$OSNAME" == "OS/390" ]]; then
     if [ -z $JOBNAME ]; then
         JOBNAME="ZKEESTRT"
     fi
     PIDS=$(ps -A -o pid,jobname,comm | grep -i $JOBNAME | grep java | grep -v grep | awk '{print $1}')
+elif [[ "$OSNAME" == "OS400" ]]; then
+    PIDS=$(ps -af | grep java | grep -i QuorumPeerMain | grep -v grep | awk '{print $2}')
 else
     PIDS=$(ps ax | grep java | grep -i QuorumPeerMain | grep -v grep | awk '{print $1}')
 fi