Incorrect override of __get_job_log_legacy by __extract_job_log_legacy

[Anbang-Hu]

DLWorkspace/src/ClusterBootstrap/template/RestfulAPI/config.yaml

Line 83 in bf6840f

__get_job_log_legacy: True

DLWorkspace/src/utils/JobRestAPIUtils.py

Line 662 in 27d3a3a

_get_job_log_legacy = config.get('__get_job_log_legacy',

If __get_job_log_legacy is false in config.yaml, its value is overriden by __extract_job_log_legacy.