iotests: Fix 100 for nbd

In case of NBD, _make_test_img starts a new NBD server. Therefore,
_cleanup_test_img (which shuts that server down) has to be invoked
before the next _make_test_img call in order to make 100 work for NBD.
Signed-off-by: NMax Reitz <mreitz@redhat.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/100

@@ -55,6 +55,8 @@ echo "== verify pattern =="
 $QEMU_IO -c "read -P 0xcd 0 4k" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IO -c "read -P 0 4k 4k" "$TEST_IMG" | _filter_qemu_io
 
+_cleanup_test_img
+
 echo
 echo "== Sequential requests =="
 _make_test_img $size
@@ -66,6 +68,8 @@ $QEMU_IO -c "read -P 0xcd 0 4k" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IO -c "read -P 0xce 4k 4k" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IO -c "read -P 0 8k 4k" "$TEST_IMG" | _filter_qemu_io
 
+_cleanup_test_img
+
 echo
 echo "== Superset overlapping requests =="
 _make_test_img $size
@@ -79,6 +83,8 @@ $QEMU_IO -c "read -P 0xcd 0 1k" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IO -c "read -P 0xcd 3k 1k" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IO -c "read -P 0 4k 4k" "$TEST_IMG" | _filter_qemu_io
 
+_cleanup_test_img
+
 echo
 echo "== Subset overlapping requests =="
 _make_test_img $size
@@ -92,6 +98,8 @@ $QEMU_IO -c "read -P 0xce 0 1k" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IO -c "read -P 0xce 3k 1k" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IO -c "read -P 0 4k 4k" "$TEST_IMG" | _filter_qemu_io
 
+_cleanup_test_img
+
 echo
 echo "== Head overlapping requests =="
 _make_test_img $size
@@ -104,6 +112,8 @@ echo "== verify pattern =="
 $QEMU_IO -c "read -P 0xce 2k 2k" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IO -c "read -P 0 4k 4k" "$TEST_IMG" | _filter_qemu_io
 
+_cleanup_test_img
+
 echo
 echo "== Tail overlapping requests =="
 _make_test_img $size
@@ -116,6 +126,8 @@ echo "== verify pattern =="
 $QEMU_IO -c "read -P 0xce 0k 2k" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IO -c "read -P 0 4k 4k" "$TEST_IMG" | _filter_qemu_io
 
+_cleanup_test_img
+
 echo
 echo "== Disjoint requests =="
 _make_test_img $size