[dashboard] Return image caching to AppCatalog

[Timur Sufiev]

During transition from fake AppModels to real AppCatalog connected to murano-api, image caching was dropped for the simplicity. But as soon as number of Applications and concurrent request in Catalog grows, the lack of caching would pose a serious performance issue. So the caching should be returned.

[Openstack Gerrit (openstack-gerrit)]

Fix proposed to branch: master
Review: https://review.openstack.org/90342

[Openstack Gerrit (openstack-gerrit)]

Reviewed: https://review.openstack.org/90342
Committed: https://git.openstack.org/cgit/stackforge/murano-dashboard/commit/?id=5951966b119a04327f1eafb16b742252e06943d5
Submitter: Jenkins
Branch: master

commit 5951966b119a04327f1eafb16b742252e06943d5
Author: Timur Sufiev <email address hidden>
Date: Fri Apr 25 15:30:48 2014 +0400

    Return caching to AppCatalog

    Cache Application logo and dynamic_ui markup on local file-system
    using `cache.with_cache` decorator. Objects are cached using cPickle
    module to allow the function cached by `cache.with_cache` to return
    arbitrary objects, not only string or buffer.

    Change-Id: Ia0d89b38be1f0776d6e910e3126d89c978db0f10
    Implements: blueprint ui-local-cache
    Partial-Bug: #1312251