pylint: More allowed C extensions

Fixes:
```
[E0611(no-name-in-module), ] No name 'parse' in module 'lxml.etree'
[E0611(no-name-in-module), ] No name 'murmurhash3' in module 'pysss_murmur'
```

Fixes: https://pagure.io/freeipa/issue/9278
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Stanislav Levin <slev@altlinux.org>

pylintrc

@@ -13,7 +13,9 @@ extension-pkg-whitelist=
     _ldap,
     cryptography,
     gssapi,
-    netifaces
+    netifaces,
+    lxml.etree,
+    pysss_murmur,
 
 [CLASSES]