Fix inspire harvesting

This PR aims to fix the INSPIRE validation against the french géocatalogue validation service: http://www.geocatalogue.fr/#!ServicesValidationMD ;

CSW:
- OGC CSW was missing the mandatory keywords in the generated service metadata
- the service name was not correct (OGC:CSW -> discovery)

WMS/WFS:
- Missing potential XML inspire prefix (inspire_ds|inspire_vs)
- Adding a wildcard prefix on the XPath

Tested onto CSW and WMS INSPIRE-aware getcapabilities responses.