Fix new pylint warnings

Similar to https://review.opendev.org/c/openstack/octavia/+/845146

Change-Id: I16863135011c37bd90d6b9733e550c2393df187c
(cherry picked from commit 69055e7c92)
(cherry picked from commit f8f2c68440)
(cherry picked from commit d7eeb68642)

.pylintrc

@@ -19,11 +19,9 @@ disable=
  anomalous-backslash-in-string,
  arguments-differ,
  attribute-defined-outside-init,
- bad-builtin,
  broad-except,
  fixme,
  global-statement,
- no-init,
  pointless-string-statement,
  protected-access,
  redefined-builtin,
@@ -34,15 +32,12 @@ disable=
  unused-variable,
  useless-super-delegation,
 # "C" Coding convention violations
- bad-continuation,
  invalid-name,
  line-too-long,
  missing-docstring,
  consider-using-f-string,
 # "R" Refactor recommendations
  duplicate-code,
- interface-not-implemented,
- no-self-use,
  too-few-public-methods,
  too-many-ancestors,
  too-many-arguments,