Add command for removing an export. It is needed for cases when we
don't want to keep the export after the operation on it was completed.
The other example is a temporary node, created with blockdev-add.
If we want to delete it we should firstly remove any corresponding
Signed-off-by: Vladimir Sementsov-Ogievskiy <email@example.com>
[eblake: drop dead nb_clients code]
Signed-off-by: Eric Blake <firstname.lastname@example.org>