Fixed admin pagination when limit is 0

[mitar]

This is an alternative fix #3444.

It is a simpler fix because it simply forces limit to never be 0. By default, if limit is given as 0, then max_limit is used as limit. But this can be changed in a subclass if somebody prefers to use default_limit in such case as well.

This allows one to request a default limit (by not providing limit query parameter) or request a max limit (by providing it with limit=0 as a query parameter).

[tomchristie]

Closed via #4194.