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blueprint oslo-cliutils
In nova-manage and cinder-manage, we allow command arguments to be
passed as optional or positional arguments.
e.g.
$> nova-manage floating create 10.0.0.1/28
$> nova-manage floating create --ip_range 10.0.0.1/28
are equivalent.
Once nova-manage has collected those arguments, it calls the
appropriate command function with them as positional and keyword
arguments. If the user forgets to supply a required argument, they
merely get a TypeError with little useful information.
Improve the usability of these commands using a new utility function
to check that the required arguments have been supplied and raise a
useful exception if not.
Change-Id: If6e4a9f222a30472bbfbcd06859865bd4e37e139
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