* `nxos_acl` may fail with `IndexError: list index out of range` while attempting to delete a non-existent ACL.
The failure occurs when the `acl` var is an empty list.
* nxos_acl: catch 501 'Structured output unsupported' when no ACLs present
With some older image versions, `show ip access-list | json` will raise a 501 error indicating `'Structured output unsupported'` when there are no access-lists configured. This change turns off the `check_rc` and then looks for the failure condition.
* Fix kwarg
* Fix lint issues
(cherry picked from commit 869fdcd7d4)
