CLOUDSTACK-6181: initial support for passing rootdisksize parameter to
    deployVirtualMachine. This currently works via 'details[0].rootdisksize=3'
    for example to get a 3G root. I'm not sure that the syntax is correct on the
    details map for deployVirtualMachine (was already implemented), so there's
    an email thread out about that.
resizeVolume: Volume can be in ready state or allocated state to resize