iotests: Add more qemu_img helpers

Add 2 helpers for measuring and checking images:
- qemu_img_measure()
- qemu_img_check()

Both use --output-json and parse the returned json to make easy to use
in other tests. I'm going to use them in a new test, and I hope they
will be useful in may other tests.

Signed-off-by: Nir Soffer <[email protected]>
Message-Id: <[email protected]>
Reviewed-by: Vladimir Sementsov-Ogievskiy <[email protected]>
Signed-off-by: Eric Blake <[email protected]>

Author: nirs

tests/qemu-iotests/iotests.py

@@ -141,6 +141,12 @@ def qemu_img_create(*args):
 
     return qemu_img(*args)
 
+def qemu_img_measure(*args):
+    return json.loads(qemu_img_pipe("measure", "--output", "json", *args))
+
+def qemu_img_check(*args):
+    return json.loads(qemu_img_pipe("check", "--output", "json", *args))
+
 def qemu_img_verbose(*args):
     '''Run qemu-img without suppressing its output and return the exit code'''
     exitcode = subprocess.call(qemu_img_args + list(args))