tests: qemublock: Add test case for detecting bitmaps as we create snapshots

Add test data gathered from a run of qemu after creating bitmaps and
snapshots together in various combinations.

The following sequence of commands was used to achieve the
configuration:

virsh checkpoint-create-as VM --name a
virsh snapshot-create-as VM --disk-only
virsh snapshot-create-as VM --disk-only
virsh checkpoint-create-as VM --name b
virsh checkpoint-create-as VM --name c
virsh snapshot-create-as VM --disk-only
virsh checkpoint-create-as VM --name d
virsh snapshot-create-as VM --disk-only
virsh checkpoint-create-as VM --name current

Note that VM was restarted after these operations to allow renumbering
of the bitmaps in a more human-readable way.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

tests/qemublocktest.c

@@ -777,6 +777,7 @@ mymain(void)
 
     TEST_BITMAP_DETECT("basic");
     TEST_BITMAP_DETECT("synthetic");
+    TEST_BITMAP_DETECT("snapshots");
 
  cleanup:
     virHashFree(diskxmljsondata.schema);

tests/qemublocktestdata/bitmap/snapshots.out

+libvirt-1-format:
+        d: record:0 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
+        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
+        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
+libvirt-5-format:
+        a: record:1 busy:0 persist:1 inconsist:0 gran:65536 dirty:0