Add environment variable VMARGS

[nikhil-sk]

Issue #, if available:

Description of changes:

1. Currently, there is no direct way to override VMARGS when starting model server. The default-mms.properties is used, which does not specify vmargs.
2. We can consider adding vmargs to default-mms.properties but that still does not allow customers to easily override it.
3. Hence, adding an env variable to override it. The defatult value of the env variable is set to: -XX:-UseContainerSupport in accordance with

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