Store block name in local blocks structure

Store block name in local blocks structure

In a later patch the block name will be used to match up two views
of the block list.  Keep a copy of the block name with the local block
list.

(At some point it could be argued that it would be best just to let
migration see the innards of RAMBlock and avoid the need to use
foreach).

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Michael R. Hines <mrhines@us.ibm.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>