[caclmgrd] Remove sleep which allowed threads to progress #7475
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Why I did it
Previously, a brief sleep was necessary in order to get Python threads to progress. The root cause of this has since been found and fixed in sonic-swss-common: sonic-net/sonic-swss-common#477. The submodule was updated here, so we can now safely remove this sleep.
This PR should also be cherry-picked to the 202012 branch once the submodule is updated there to also include the fix.
How to verify it
Ensure the update threads progress in caclmgrd
Which release branch to backport (provide reason below if selected)