split atuned.cnf to atuned.cnf and engine.cnf
update models in rpm build to solve different sklearn compatibility
update README.md
update version to v0.3
Signed-off-by: NZhipeng Xie <xiezhipeng1@huawei.com>

change file name: app-engine.py -> app_engine.py

separate training to atune-engine
change structure and .spec file to build atune-engine as a individual rpm