* Add param of specified thirdparty path
1. The thirdparth path can be specify on build.sh: ./build.sh --thirdparty /specified/path/to/thirdparty
2. If there are only thirdparty param of build.sh, it will build both fe and be
3. Add unit test of routine load stmt
4. Remove source code in docker image
* Add DORIS_THIRDPARTY env in docker image
1. Set DORIS_THIRDPARTY env in docker image. The build.sh will use /var/local/thirdparty instead of /source/code/thirdparty
2. remove --thirdparty param of build.sh
* Change image workdir to /root
