Simulate commit between all the combinations of layers in the
'snapshots' case to see whether the code merges the correct bitmaps with
the correct depth of temporary bitmaps.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

Upcoming patches are going to rewrite and semantically modify how
bitmaps are handled during blockjobs. This is possible as incremental
backup is not yet fully enabled.

As the changes are going to be incompatible with any current test data
remove all test cases for bitmap handling during checkpoint deletion,
incremental backups, block commit, block copy, and bitmap validation
operations.

The tests will be gradually added back later after the code and
test-data is refactored.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

Test handling of more complex cases of merging bitmaps accross
snapshots.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

Use some of the existing bitmap data to add tests for
qemuBlockBitmapsHandleBlockcopy.

As the output depends on the ordering in the hash table we must also
install the "virdeterministichash" mock preload library.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>