[OSC] Parameters for "dataprocessing image tags add" expected in different order than the description

[Luigi Toscano]

Tested on a recent release of RDO Mitaka:
python-saharaclient-0.13.1-0.20160316072305.f1dd01f

$ openstack help dataprocessing image tags add
usage: openstack dataprocessing image tags add [-h]
                                               [-f {html,json,json,shell,table,value,yaml,yaml}]
                                               [-c COLUMN]
                                               [--max-width <integer>]
                                               [--noindent] [--prefix PREFIX]
                                               --tags <tag> [<tag> ...]
                                               <image>
.....

But then:
$ openstack dataprocessing image tags add --tags vanilla 2.7.1 c7-vanilla
usage: openstack dataprocessing image tags add [-h]
                                               [-f {html,json,json,shell,table,value,yaml,yaml}]
                                               [-c COLUMN]
                                               [--max-width <integer>]
                                               [--noindent] [--prefix PREFIX]
                                               --tags <tag> [<tag> ...]
                                               <image>
openstack dataprocessing image tags add: error: too few arguments

This works instead:
$ openstack dataprocessing image tags add c7-vanilla_2_7_1-l-20160315 --tags vanilla 2.7.1

So either the help message should be fixed, or the parameters should be accepted according the current help message.

[Andrey Pavlov (apavlov-n)]

The order of arguments in help message (and format of help message in general) cannot be fixed on saharaclient side. It's all about openstackclient/cliff/argparse (depending on where it actually was overridden).
"--tags" parameter expects one or more arguments to be present, so c7-vanilla from your example was considered as a tag.

I would say it shouldn't be fixed, but if it's really confused, "image" argument can be made optional or tags can be added one by one via "--tag" parameter.