Enable vmargs argument for torchserve #148
                
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Issue #, if available:
The torchserve vmargs argument is hard-coded and by default uses a small fraction of the total available memory. This causes issues when loading models into memory.
Description of changes:
The torchserve configuration process now respects the pre-existing environment variable "SAGEMAKER_MODEL_SERVER_VMARGS". When this environment variable is missing, the default value (taken from sagemaker_inference.environment) matches the previously hard-coded value.
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