[[--wip--]] scripts: preload DSS modules for LVM

[jdef]

High-level description (required)

What features does this change enable? / What bugs does this change fix?

Corresponding tickets (required)

These JIRA ticket(s) must be updated (ideally closed) in the moment this PR lands:

• DCOS- Foo the Bar so it stops Bazzing.

Related tickets (optional)

Other tickets related to this change

• DCOS- Foo the Bar so it stops Bazzing.

Related PRs (optional)

Is this change going to be propagated up into dcos-integration-tests in dcos/dcos or another repo? Does this change require changes in dcos-test-utils? Link the corresponding PRs here:

Checklist for all PRs

• Included a test which will fail if code is reverted but test is not. If there is no test please explain here:
• Added or updated any relevant documentation

Integration tests were run and

• AWS Cloudformation Simple (link to job: )
• Azure Resource Manager (link to job: )
• Onprem-AWS (link to job: )
• Onprem-GCE (link to job: )

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