fixed env variable (#132)

Author: NRauschmayr

smdebug/core/access_layer/utils.py

@@ -16,7 +16,7 @@
 from .s3 import TSAccessS3
 
 END_OF_JOB_FILENAME = "training_job_end.ts"
-ENV_RULE_STOP_SIGNAL_FILENAME = "SAGEMAKER.ENV_RULE_STOP_SIGNAL_FILE"
+ENV_RULE_STOP_SIGNAL_FILENAME = "SAGEMAKER_ENV_RULE_STOP_SIGNAL_FILE"
 DEFAULT_GRACETIME_FOR_RULE_STOP_SEC = 60
 RULE_JOB_STOP_SIGNAL_FILENAME = os.getenv(ENV_RULE_STOP_SIGNAL_FILENAME, default=None)
 RULESTOP_GRACETIME_SECONDS = os.getenv(