Fuel Plugin Builder doesn't support `mitaka-9.0` release version

[Alexander Kurenyshev]

Since we've switched to mitaka development we should add a 9.0 Fuel version
and "mitaka-9.0" to supported openstack versions
to the example plugin 4, to make possible an installation of that plugin
under Fuel 9.0. Because plugins' version 4.0.0 is still supported by Fuel 9.0

[0] https://github.com/openstack/fuel-plugins

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/287853

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/287853
Committed: https://git.openstack.org/cgit/openstack/fuel-plugins/commit/?id=58f0370530d4b2446226d20b9b0676ff6ee2010c
Submitter: Jenkins
Branch: master

commit 58f0370530d4b2446226d20b9b0676ff6ee2010c
Author: Alexander Kislitsky <email address hidden>
Date: Thu Mar 3 17:40:34 2016 +0300

    Support of mitaka-9.0 added to plugins V4

    Plugins V4 are able to be installed on Fuel 9.0 with release
    mitaka-9.0. Metadata template changed for generate plugins
    for the latest OpenStack release version.

    Change-Id: Ic055a3738a670ddc096b1e12e1fe419e9934a092
    Closes-Bug: #1549276

[Tatyanka (tatyana-leontovich)]

76 iso plugins could not be enabled due to version errors

[Aleksei Stepanov (penguinolog)]

https://product-ci.infra.mirantis.net/view/9.0_swarm/job/9.0.system_test.ubuntu.fuel_plugin_vip_reservation/ PASS

[Vladimir (vushakov)]

Verified on:
    Fuel 9.0 ISO #91