mark shell=False in ExecProvider for linux/darwin platforms

[akhilputhiry]

What type of PR is this?

/kind bug

What this PR does / why we need it:

NONE

Which issue(s) this PR fixes:

Fixes #2333

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: akhilputhiry / name: Akhil Lawrence (e852ac7)

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[yliaog]

/assign

[yliaog]

/assign @jrwren

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[yliaog]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: akhilputhiry, jrwren, yliaog

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