docker/docker_entrypoint.sh: Use `$SGE_ROOT` to generalize Grid Engine patch.
docker/docker_entrypoint.sh: Use `$SGE_ROOT` to generalize Grid Engine patch.

nanshe-org/docker_centos_drmaa_conda,DudLab/docker_centos_drmaa_conda,jakirkham/docker_centos_drmaa_conda,jakirkham/docker_basic,jakirkham/docker_ubuntu_drmaa_conda