[CI] Use Vault repository to re-gain access to devtoolset-4 (#5589)

* [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

tests/ci_build/test_python.sh

@@ -7,6 +7,7 @@ suite=$1
 # Install XGBoost Python package
 function install_xgboost {
   wheel_found=0
+  pip install --upgrade pip --user
   for file in python-package/dist/*.whl
   do
     if [ -e "${file}" ]