help for "package-import" shows incorrect argument order

[Anastasia Kuznetsova]

Steps to reproduce:
~# murano package-import -c test package.zip

Observed result:
~# murano package-import -c test package.zip
usage: murano package-import [-c [<CAT1 CAT2 CAT3> [<CAT1 CAT2 CAT3> ...]]]
                             [--is-public] [--version VERSION]
                             [--exists-action {a,s,u}]
                             <FILE>
murano package-import: error: too few arguments

User gets error message while the same order is shown in help text

This command works if <FILE> goes before categories.

So need to fix help text or I guess that it is more correct to fix work of command

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/209919

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/209919
Committed: https://git.openstack.org/cgit/openstack/python-muranoclient/commit/?id=b012ef2e162f950eea0fc21b0b4c516d2fde13fa
Submitter: Jenkins
Branch: master

commit b012ef2e162f950eea0fc21b0b4c516d2fde13fa
Author: Kirill Zaitsev <email address hidden>
Date: Thu Aug 6 15:56:30 2015 +0300

    Updated package-import help description

    Improved category metavar.
    Removed incorrect note of possibility to use comma in categorie list
    Added note about possibility to use -- to separate positional FILE
    arguments from the rest of arguments.

    Change-Id: Ia6e8f7c35bfb912d526db23a6bf8e766e7765187
    Closes-Bug: #1478912