Fix limit with cursor

[ADR-007]

Related issue

[AxeemHaider]

This issue was working fine for me. Don't know why you are facing this issue and I'm not able to understand what you change, can you please explain your changes.

Thanks

[ADR-007]

All the tests fail without the changes. But please let me know if you think it is not the expected behavior.

The main problem was that in .fetch() it has limit=None by default. So, it deletes limit from cursor, but not from query:

self.cursor_dict['limit'] = limit
if limit:
    self.n_limit = limit

So, I could not use query like query.limit(5).fetch() because it sets "no limit" in the cursor. So, I have to use query.fetch(5) or query.limit(5).fetch(5)

Also, .limit(None) removed the limit from the cursor but not from this query in a similar way:

self.cursor_dict['limit'] = count
if count:
    self.n_limit = count

P.S: I don't use the cursor anymore, so this problem is not actual for me anymore :)