Replace to isinstance

[Spiritedswordsman]

This PR brings updates to various files as mentioned in the issue #2636 where type() is replaced by isinstance()

Closes #2636

[sebix]

Looked at a few files and found various sloppiness errors.
That also indicates that you didn't even try to run the tests.

Please review once again.

[sebix]

Slightly better, but you still missed two in the list:

• intelmq/lib/test.py: elif issubclass(type(msg), message.Message):
• intelmq/lib/message.py: if dict_eq and issubclass(type(other), Message):

[sebix]

Have a look at the failing tests.