umockdev recordings are usually not usable as is. Add some notes to the README to summarise what kind of changes may be required.
As the driver is not a normal image device, we need to add a custom script to test it. Note that the ioctl dump must also be manually modified unfortunately as the state is tracked incorrectly for the device by umockdev-record.
Initially only the vfs5011 driver is tested. Please note that these tests will be unreliable before umockdev 0.13.2. See also https://github.com/martinpitt/umockdev/pull/92