GC not cleaning version objects if session is always alive

[dgasull]

After consolidating an object, GC should remove all versions created.

For GC, session, alias and federation references (i.e. any replica location in another dataClay) 'retain' the object.

If we run a COMPSs application that starts and finishes, then all versions are removed when session is closed, however, if the application never ends or we are interested on cleaning versioned objects, we cannot do it since the session is retaining them.

Consolidate algorithm only updates original replica but is not "going to each version to detach the object from the session", since this could be a performance penalty.

Any suggestions?