DSP-11638: Update setEnv to point to Logback file

Previously the setEnv pointed towards a non-existent log4j file. We use
the logback-server xml file so the LOGGING_OPTIONS were changed
accordingly.

Author: RussellSpitzer

bin/setenv.sh

@@ -43,7 +43,7 @@ if [ -z "$LOG_DIR" ]; then
 fi
 mkdir -p $LOG_DIR
 
-LOGGING_OPTS="-Dlog4j.configuration=file:$appdir/log4j-server.properties
+LOGGING_OPTS="-Dlogback.configurationFile=file:$appdir/logback-server.xml
               -DLOG_DIR=$LOG_DIR"
 
 # For Mesos