update hadoop

hadoop/2.7.4/bootstrap.sh

@@ -9,8 +9,12 @@ rm /tmp/*.pid
 # installing libraries if any - (resource urls added comma separated to the ACP system variable)
 cd $HADOOP_PREFIX/share/hadoop/common ; for cp in ${ACP//,/ }; do  echo == $cp; curl -LO $cp ; done; cd -
 
-# replace config
-cp /mnt/hadoop-config/* $HADOOP_PREFIX/etc/hadoop/
+## replace config
+: ${EXTRA_CONF_DIR:=/config/hadoop}
+
+if [ -d "$EXTRA_CONF_DIR" ]; then
+	cp $EXTRA_CONF_DIR/* $HADOOP_PREFIX/etc/hadoop/
+fi
 
 /usr/sbin/sshd