built-in paths for logout pages to avoid for crawl

[ehsandeep]

Please describe your feature request:

katana to use a built-in it list/path for logout pages to exclude for crawl (-cos).

Describe the use case of this feature:

Avoid accidental logouts with authenticated crawling.

Note:

1. -cs option will overwrite the built-in -cos list / values
2. this addition is to only avoids crawling of logout pages, katana will still report/display discovered logout endpoints.

[ShubhamRasal]

Depends on #310
authenticated crawling should avoid logout paths