query: use the actual types for BE/HV parameters

This patch exposes the VTYPE kind of BE/HV parameters, instead of
returning QFT_OTHER. The current situation makes a query like:

    gnt-instance list -o name,be/memory,oper_ram

very strange looking.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>