astakos: Support units in resource-related commands
Add library synnefo.util.units for parsing numerical values with an optional unit suffix and printing integer values based on a given style. Styles `b', `kb', `mb', etc allow printing in the respective multiples of byte, style `auto' in a human-readable manner, while `none' omits units altogether. Add option `--unit-style' in all astakos management commands that print resource limits and quota usage. Consult the resource definitions to find out which unit, if any, to show. For resources with unit `bytes', all commands default to MB.
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