[GEOS-6785]WCS GetCapabilities 1.1.1 has invalid metadataType attribute

WCS GetCapabilities request had a metadataType attribute which isn't allowed according to the XSD (owsCommon 1.1.1). Thus I have removed this item from being generated.
Merge pull request #833 from Geodan/GEOS-6785

[GEOS-6785]WCS GetCapabilities 1.1.1 has invalid metadataType attribute