v1beta1 does not correctly validate the name of additionalBlockDevices #2013
Description
/kind bug
v1beta1 permits creating an additionalBlockDevice with an empty name, and with the name "root". There may be other issues.
I wrote test cases for these when writing #2008 but noticed that they were failing. I left the code in, commented out. Assuming that PR merges, we should uncomment those tests and fix them.