iotests: 211: Remove duplication with VM.blockdev_create()

The blockdev_create() function in this test case adds an error check
that skips the test in case of failure because of memory shortage, but
provides otherwise the same functionality as VM.blockdev_create() from
iotests.py. Make it a thin wrapper around the iotests.py function.

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

tests/qemu-iotests/211

@@ -27,15 +27,9 @@ iotests.verify_image_format(supported_fmts=['vdi'])
 iotests.verify_protocol(supported=['file'])
 
 def blockdev_create(vm, options):
-    result = vm.qmp_log('blockdev-create', job_id='job0', options=options,
-                        filters=[iotests.filter_qmp_testfiles])
-
-    if 'return' in result:
-        assert result['return'] == {}
-        error = vm.run_job('job0')
+    error = vm.blockdev_create(options)
     if error and 'Could not allocate bmap' in error:
         iotests.notrun('Insufficient memory')
-    iotests.log("")
 
 with iotests.FilePath('t.vdi') as disk_path, \
      iotests.VM() as vm: