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H A D083d98205c5 Mon Oct 15 15:03:19 CDT 2018 Cleber Rosa <crosa@redhat.com> iotests: make 083 specific to raw

While testing the Python 3 changes which touch the 083 test, I noticed
that it would fail with qcow2. Expanding the testing, I noticed it
had nothing to do with the Python 3 changes, and in fact, it would not
pass on anything but raw:

raw: pass
bochs: not generic
cloop: not generic
parallels: fail
qcow: fail
qcow2: fail
qed: fail
vdi: fail
vhdx: fail
vmdk: fail
vpc: fail
luks: fail

The errors are a mixture I/O and "image not in xxx format", such as:

=== Check disconnect before data ===

Unexpected end-of-file before all bytes were read
-read failed: Input/output error
+can't open device nbd+tcp://127.0.0.1:PORT/foo: Could not open 'nbd://127.0.0.1:PORT/foo': Input/output error

=== Check disconnect after data ===

-read 512/512 bytes at offset 0
-512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+can't open device nbd+tcp://127.0.0.1:PORT/foo: Image not in qcow format

I'm not aware if there's a quick fix, so, for the time being, it looks
like the honest approach is to make the test known to work on raw
only.

Signed-off-by: Cleber Rosa <crosa@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>