Refactor Client.parse_url()

[ilongin]

The problem with this method is that we are mostly using it just to split url to base one and path and we don't actually need Client instance as return. Client instance requires cache so currently .parse_url() requires it as well which makes it unhandy when using in places where we just need split url.

We should create separate method to split url and maybe rename this one to something related to Client object which is returned.