Fix linting errors; fix some real bugs (#5111) (#5114)

* Fix linting errors.

* Fix bugs.

* Another linter error ignored.

* More fixes.

* Ignore sanity errors with older versions.

ci_complete

* Forgot to commit more changes.

(cherry picked from commit a54af8909c)

Co-authored-by: Felix Fontein <felix@fontein.de>

plugins/module_utils/redis.py

@@ -16,6 +16,7 @@ try:
     from redis import Redis
     from redis import __version__ as redis_version
     HAS_REDIS_PACKAGE = True
+    REDIS_IMP_ERR = None
 except ImportError:
     REDIS_IMP_ERR = traceback.format_exc()
     HAS_REDIS_PACKAGE = False
@@ -23,6 +24,7 @@ except ImportError:
 try:
     import certifi
     HAS_CERTIFI_PACKAGE = True
+    CERTIFI_IMPORT_ERROR = None
 except ImportError:
     CERTIFI_IMPORT_ERROR = traceback.format_exc()
     HAS_CERTIFI_PACKAGE = False