os-helpers: silence command output

[alexgg]

Change-type: patch

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• [ ] Changes have been tested
  • [ ] Covered in automated test suite
  • [ ] Manual test case recorded
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[klutchell]

Duplicate of https://github.com/balena-os/meta-balena/pull/3389 ?

[alexgg]

Duplicated in https://github.com/balena-os/meta-balena/pull/3389