block/dirty-bitmap: change semantics of enabled predicate

block/dirty-bitmap: change semantics of enabled predicate

Currently, the enabled predicate means something like:
"the QAPI status of the bitmap is ACTIVE."
After this patch, it should mean exclusively:
"This bitmap is recording guest writes, and is allowed to do so."

In many places, this is how this predicate was already used.
Internal usages of the bitmap QPI can call user_locked to find out if
the bitmap is in use by an operation.

To accommodate this, modify the create_successor routine to now
explicitly disable the parent bitmap at creation time.

Justifications:

1. bdrv_dirty_bitmap_status suffers no change from the lack of
   1:1 parity with the new predicates because of the order in which
   the predicates are checked. This is now only for compatibility.

2. bdrv_set_dirty() is unchanged: pre-patch, it was skipping bitmaps that were
   disabled or had a successor, while post-patch it is only skipping bitmaps
   that are disabled. To accommodate this, create_successor now ensures that
   any bitmap with a successor is explicitly disabled.

3. qcow2_store_persistent_dirty_bitmaps: No functional change. This function
   cares only about the literal enabled bit, and makes no effort to check if
   the bitmap is in-use or not. After this patch there are still no ways to
   produce an enabled bitmap with a successor.

4. block_dirty_bitmap_enable_prepare
   block_dirty_bitmap_disable_prepare
   init_dirty_bitmap_migration
   nbd_export_new

   These functions care about the literal enabled bit,
   and already check user_locked separately.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20190223000614.13894-5-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>