qemublocktest: Replace 'snapshots' bitmap detection test case data

Use test data which conforms to the new semantics which changed in the
previous patch.

The test data was created by the same set of commands as originally in
commit 0b27b655Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

tests/qemublocktestdata/bitmap/snapshots.out

 libvirt-1-format:
-        d: record:0 busy:0 persist:1 inconsist:0 gran:65536 dirty:0
+        d: record:1 busy:0 persist:1 inconsist:0 gran:65536 dirty:0
+        a: record:1 busy:0 persist:1 inconsist:0 gran:65536 dirty:0
+        b: record:1 busy:0 persist:1 inconsist:0 gran:65536 dirty:0
+        c: record:1 busy:0 persist:1 inconsist:0 gran:65536 dirty:0
   current: record:1 busy:0 persist:1 inconsist:0 gran:65536 dirty:0
 libvirt-2-format:
-        c: record:0 busy:0 persist:1 inconsist:0 gran:65536 dirty:0
+        c: record:1 busy:0 persist:1 inconsist:0 gran:65536 dirty:0
+        b: record:1 busy:0 persist:1 inconsist:0 gran:65536 dirty:0
+        a: record:1 busy:0 persist:1 inconsist:0 gran:65536 dirty:0
         d: record:1 busy:0 persist:1 inconsist:0 gran:65536 dirty:0
 libvirt-3-format:
-        a: record:0 busy:0 persist:1 inconsist:0 gran:65536 dirty:0
-        b: record:0 busy:0 persist:1 inconsist:0 gran:65536 dirty:0
+        a: record:1 busy:0 persist:1 inconsist:0 gran:65536 dirty:0
+        b: record:1 busy:0 persist:1 inconsist:0 gran:65536 dirty:0
         c: record:1 busy:0 persist:1 inconsist:0 gran:65536 dirty:0
 libvirt-4-format:
         a: record:1 busy:0 persist:1 inconsist:0 gran:65536 dirty:0