[dashboard] Package import button missing, list categories broken

[Felipe Monteiro]

After https://review.openstack.org/#/c/476273/ was merged, murano dashboard is throwing errors related to listing categories when trying to import a package. Currently, python-muranoclient still contains a function for listing categories using the deprecated API v1/packages/categories. The problem is that murano dashboard calls this function in python-muranoclient which throws a 404, as the deprecated API was removed form murano.

Steps to reproduce:
Go to App Catalog > Manage > Packages
Try to click on Import Package Button

Expected:
The button should be present and clickable

Actual:
It is not clickable

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/478615

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/478615
Committed: https://git.openstack.org/cgit/openstack/murano-dashboard/commit/?id=51cbeb664036a448b8ad55b7e353d553f305c561
Submitter: Jenkins
Branch: master

commit 51cbeb664036a448b8ad55b7e353d553f305c561
Author: Felipe Monteiro <email address hidden>
Date: Wed Jun 28 20:31:06 2017 +0100

    Fix missing import package button in murano dashboard

    After https://review.openstack.org/#/c/476273/ was merged, murano
    dashboard is throwing errors related to listing categories when
    trying to import a package. Currently, python-muranoclient still
    contains a function [0] for listing categories using the deprecated
    API v1/packages/categories. The problem is that murano dashboard
    calls this function [1][2][3] in python-muranoclient which throws a 404,
    as the deprecated API was removed from murano.

    This commit replaces instances of client.packages.categories() with
    client.categories.list(). However, while the former returns a list
    of category names, the latter returns of a list of category objects
    -- so they then need to be iterated over to retrieve the list
    of category names.

    [0] https://github.com/openstack/python-muranoclient/blob/08411aa8d20993ac7c4a52b2aa0e73fb6fea4d40/muranoclient/v1/packages.py#L52
    [1] https://github.com/openstack/murano-dashboard/blob/f98e08d827a006db5fd054ac4fb6abba786bb414/muranodashboard/packages/forms.py#L216
    [2] https://github.com/openstack/murano-dashboard/blob/f98e08d827a006db5fd054ac4fb6abba786bb414/muranodashboard/packages/forms.py#L288
    [3] https://github.com/openstack/murano-dashboard/blob/bc8e4b97d083bfccf916e5538fcdb6ee1cbc4405/muranodashboard/packages/tables.py#L54

    Change-Id: I715b1c9ccfdd044980596cc6d966062e0386884c
    Partial-Bug: #1701067