Metacat

Add the check objectFormat is not null before we try to get the mediaType object from the object in the getObject method.

Don't need to add "." for file name between the identifier and file extention in the getObject method.
The v1 getExtension method includes '.'. But the v2 version doesn't include it.

Use the method getContextURL rather than getSecureContextURL in the getCapacities method.
So if the server doesn't support sll, the getCapacities will return a baseURL with http.

correct two minor differences from 2.6 merge: formatId parameter for MetacatHandler and using AuthUtils for gathering group membership information.

Merge in changes from the 2.6.0 release.

Merge changes from the 2.6.0 release.

merge from 2.6 branch: add support for EML 2.1.1 to DC crosswalking for OAI provider. https://projects.ecoinformatics.org/ecoinfo/issues/7030

If the client certificate is null, Metacat will throw an exception.

merge from 2.6 branch: use AuthUtils to gather user group subjects

merge to trunk from 2.6 branch: action=validatesession can handle Authorization token