iotests: define group in each iotest

We are going to drop group file. Define group in tests as a preparatory
step.

The patch is generated by

    cd tests/qemu-iotests

    grep '^[0-9]\{3\} ' group | while read line; do
        file=$(awk '{print $1}' <<< "$line");
        groups=$(sed -e 's/^... //' <<< "$line");
        awk "NR==2{print \"# group: $groups\"}1" $file > tmp;
        cat tmp > $file;
    done

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210116134424.82867-7-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/tests/qemu-iotests/270 b/tests/qemu-iotests/270
index 00339c0f78..74352342db 100755
--- a/tests/qemu-iotests/270
+++ b/tests/qemu-iotests/270
@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+# group: rw backing quick
 #
 # Test large write to a qcow2 image
 #