Update function to get catalog URI

[huynguyen-95]

Dear dcat project,
I'm working with CKAN and using DCAT extension.
The problem here is happened when CKAN is deployed as non-root (e.g.: http://myhost.com/ckan)

The URI for getting the relevant entities is generated based on ckanext.dcat.base_uri or ckan.site_url.
I did not use the first option ckanext.dcat.base_uri because I want to centralize everything based on ckan.site_url but DCAT plugin generate the wrong URI (e.g.: http://myhost.com) because my CKAN is deployed as non-root

And I checked code, in ultils.py, we should add ckan.root_path at line 162

ckanext-dcat/ckanext/dcat/utils.py

Line 162 in 6b7ec50

uri = config.get('ckan.site_url')

It should be:

uri = config.get('ckan.site_url') + config.get('ckan.root_path')

About ckan.root_path, you could check here: ckan.root_path

Thanks,
Huy