Fix pylint failures in upstream CI.

The new version of pylint (pylint-2.17.2-1.fc38) in F38 causes failures
due to containing a configuration setting that will become invalid in
pylint 3. The pylintrc file is future-proofed to work with pylint 3.

overgeneral-exceptions now causes test failure rather than a warning, it
has been disabled for now as there are many failures and it could take
some time to go through them all individually and catch less general
exceptions.

tests/pylintrc

@@ -47,7 +47,7 @@ extension-pkg-whitelist=ldap,lxml,nss
 #
 # C and R messages are disabled by default. To clean up the code, enable C and
 # R messages temporarily.
-disable=W0511,W0105,W0142,C,R,W0232,W0707
+disable=W0511,W0105,W0142,C,R,W0232,W0707,W0719
 
 
 [REPORTS]
@@ -243,4 +243,4 @@ int-import-graph=
 
 # Exceptions that will emit a warning when being caught. Defaults to
 # "Exception"
-overgeneral-exceptions=Exception
+overgeneral-exceptions=builtins.Exception