[FLINK-11224][scala-shell] Log is missing in scala-shell

Logging configuration was set only for scala-shell in yarn mode. This commit sets the configuration for local and remote mode in start-scala-shell.sh script as well.

flink-scala-shell/start-script/start-scala-shell.sh

@@ -82,15 +82,26 @@ do
  fi
 done
 
-log_setting=""
+if [ "$FLINK_IDENT_STRING" = "" ]; then
+ FLINK_IDENT_STRING="$USER"
+fi
+
+MODE=$1
+LOG=$FLINK_LOG_DIR/flink-$FLINK_IDENT_STRING-scala-shell-$MODE-$HOSTNAME.log
 
-if [[ $1 = "yarn" ]]
+if [[ ($MODE = "local") || ($MODE = "remote") ]]
 then
-FLINK_CLASSPATH=$FLINK_CLASSPATH:$HADOOP_CLASSPATH:$HADOOP_CONF_DIR:$YARN_CONF_DIR
-log=$FLINK_LOG_DIR/flink-$FLINK_IDENT_STRING-scala-shell-yarn-$HOSTNAME.log
-log_setting="-Dlog.file="$log" -Dlog4j.configuration=file:"$FLINK_CONF_DIR"/log4j-yarn-session.properties -Dlogback.configurationFile=file:"$FLINK_CONF_DIR"/logback-yarn.xml"
+ LOG4J_CONFIG=log4j.properties
+ LOGBACK_CONFIG=logback.xml
+elif [[ $1 = "yarn" ]]
+then
+ LOG4J_CONFIG=log4j-yarn-session.properties
+ LOGBACK_CONFIG=logback-yarn.xml
+ FLINK_CLASSPATH=$FLINK_CLASSPATH:$HADOOP_CLASSPATH:$HADOOP_CONF_DIR:$YARN_CONF_DIR
 fi
 
+log_setting="-Dlog.file="$LOG" -Dlog4j.configuration=file:"$FLINK_CONF_DIR"/$LOG4J_CONFIG -Dlogback.configurationFile=file:"$FLINK_CONF_DIR"/$LOGBACK_CONFIG"
+
 if ${EXTERNAL_LIB_FOUND}
 then
  java -Dscala.color -cp "$FLINK_CLASSPATH" $log_setting org.apache.flink.api.scala.FlinkShell $@ --addclasspath "$EXT_CLASSPATH"