Update example plugin accordingly to the new format 4 version

[Alexander Kurenyshev]

We have a new format for plugins version 4. It is described here [1]
But here [2] we have an outdated format which is copy-pasted from version 3. And examples 4 plugins should be updated.
Because for now when we generating a new plugin with FuelPluginBuilder, it builds an old version content but with plugin_version==4.0.0

[1] https://github.com/openstack/fuel-plugins/tree/master/fuel_plugin_builder/templates/v4/plugin_data
[2] https://github.com/openstack/fuel-plugins/tree/master/examples/fuel_plugin_example_v4

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/269785

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/8.0
Review: https://review.openstack.org/272561

[OpenStack Infra (hudson-openstack)]

Change abandoned by Ilya Kutukov (<email address hidden>) on branch: stable/8.0
Review: https://review.openstack.org/272561

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/268282
Committed: https://git.openstack.org/cgit/openstack/fuel-web/commit/?id=3ecb245061899490b5ec0b314aea6214c12f8cb7
Submitter: Jenkins
Branch: master

commit 3ecb245061899490b5ec0b314aea6214c12f8cb7
Author: Ilya Kutukov <email address hidden>
Date: Fri Jan 15 21:35:31 2016 +0300

    Plugin package v5.0.0 support introduced

    Plugins v5.0.0 use task-based deployment directives using tasks
    v2.0.0 with cross-dependencies and per-task strategy.

    V4.0.0 allows both experimental and granular deployment directives
    (tasks v1.0.0 and tasks v2.0.0) and using them according to `task_deploy`
    environment flag setting.

    Change-Id: I697dc22a58a9ff2ad8bd9d955d2b2c5351c746ab
    Closes-Bug: #1533771

[Bulat Gaifullin (bulat.gaifullin)]

Up priority, since customers needs this functional in 8.0

[Bulat Gaifullin (bulat.gaifullin)]

Also the patch is trivial and it helps for customers test their plugins with task-based-deployment.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/272561
Committed: https://git.openstack.org/cgit/openstack/fuel-web/commit/?id=0f066ac2aa52e3ec6620297e6e9b0a1edc69b71d
Submitter: Jenkins
Branch: stable/8.0

commit 0f066ac2aa52e3ec6620297e6e9b0a1edc69b71d
Author: Ilya Kutukov <email address hidden>
Date: Fri Jan 15 21:35:31 2016 +0300

    Plugin package v5.0.0 support introduced

    Plugins v5.0.0 use task-based deployment directives using tasks
    v2.0.0 with cross-dependencies and per-task strategy.

    V4.0.0 allows both experimental and granular deployment directives
    (tasks v1.0.0 and tasks v2.0.0) and using them according to `task_deploy`
    environment flag setting.

    Change-Id: I697dc22a58a9ff2ad8bd9d955d2b2c5351c746ab
    Closes-Bug: #1533771

[Ilya Kutukov (ikutukov)]

This bug was triggered to fix commited state by mistake due misprint in commit tag.

[Alexander Kislitsky (akislitsky)]

Link to review: https://review.openstack.org/#/c/269785/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/269785
Committed: https://git.openstack.org/cgit/openstack/fuel-plugins/commit/?id=3d056b76633308ff16284c0f03c96f5681081cdb
Submitter: Jenkins
Branch: master

commit 3d056b76633308ff16284c0f03c96f5681081cdb
Author: Ilya Kutukov <email address hidden>
Date: Tue Jan 19 20:46:13 2016 +0300

    Example plugins and templates is updated accordingly to package version v4.0.0

    Task-based deployment is intoduced as experimental orchestrator in Fuel v8.0.0
    Plugins v4.0.0 could use tasks v2.0.0 in deployment_tasks.yaml

    Also small problem with existing but empty legacy tasks.yaml is fixed.

    Change-Id: Ibf8d65833b74c79e0c63ae9c51995c953b83d301
    Closes-Bug: #1533771
    Related-Bug: #1534235