[jvm-packages] update xgboost4j cross build script to be compatible with older glibc (#3307)

* add back train method but mark as deprecated

* add back train method but mark as deprecated

* fix scalastyle error

* fix scalastyle error

* static glibc glibc++

* update to build with glib 2.12

* remove unsupported flags

* update version number

* remove properties

* remove unnecessary command

* update poms

jvm-packages/dev/build-docker.sh

@@ -2,4 +2,4 @@
 
 set -x
 
-sudo docker run --rm -m 4g -e JAVA_OPTS='-Xmx6g' --attach stdin --attach stdout --attach stderr --volume `pwd`/../:/xgboost codingcat/xgboost:latest /xgboost/jvm-packages/dev/build.sh
+sudo docker run --rm -m 4g -e JAVA_OPTS='-Xmx6g' --attach stdin --attach stdout --attach stderr --volume `pwd`/../:/xgboost codingcat/xgbrelease:latest /xgboost/jvm-packages/dev/build.sh

jvm-packages/dev/build.sh

@@ -1,15 +1,20 @@
 #!/usr/bin/env bash
 
-set -e
+set -x
 
-apt-get update
-apt-get -y install g++-4.8
-apt-get -y install git openjdk-8-jdk maven python cmake
-update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 50
-
-export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
-export CXX=g++
+export JAVA_HOME=/usr/lib/jvm/java-1.8.0
 export MAVEN_OPTS="-Xmx3000m"
+export CMAKE_CXX_COMPILER=/opt/rh/devtoolset-2/root/usr/bin/gcc
+export CXX=/opt/rh/devtoolset-2/root/usr/bin/g++
+export CC=/opt/rh/devtoolset-2/root/usr/bin/gcc
+
+export PATH=$CXX:$CC:/opt/rh/python27/root/usr/bin/python:$PATH
+
+scl enable devtoolset-2 bash
+scl enable python27 bash
+
+rm /usr/bin/python
+ln -s /opt/rh/python27/root/usr/bin/python /usr/bin/python
 
 # build xgboost
 cd /xgboost/jvm-packages;mvn package

jvm-packages/xgboost4j/src/main/resources/xgboost-tracker.properties

@@ -1 +0,0 @@
-host-ip=0.0.0.0