* [CI] Use Vault repository to re-gain access to devtoolset-4
* Use manylinux2010 tag
* Update Dockerfile.jvm
* Fix rename_whl.py
* Upgrade Pip, to handle manylinux2010 tag
* Update insert_vcomp140.py
* Update test_python.sh
* Add CMake option to use bundled gtest from dmlc-core, so that it is easy to build XGBoost with gtest on Windows
* Consistently apply OpenMP flag to all targets. Force enable OpenMP when USE_CUDA is turned on.
* Insert vcomp140.dll into Windows wheels
* Add C++ and Python tests for CPU and GPU targets (CUDA 9.0, 10.0, 10.1)
* Prevent spurious msbuild failure
* Add GPU tests
* Upgrade dmlc-core