[UI] Please move multi-node support to experimental

[Mike Scherbakov]

It looks like it doesn't make sense to go into production deployments with multi-node deployment mode (also called simple mode, no HA).
As we support 1 node installation in HA, and then further ability to scale up to 3/5/etc. nodes, there is no need to have just multi-node. It might be still needed for development purposes: to install less software on node, so to have faster feedback in dev cycle.

So suggestion is to move multi-node mode to experimental feature group. This also impacts documentation.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/142829

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/142829
Committed: https://git.openstack.org/cgit/stackforge/fuel-web/commit/?id=d27fa634306d26c8692a8ee8bf8b70dd051503e1
Submitter: Jenkins
Branch: master

commit d27fa634306d26c8692a8ee8bf8b70dd051503e1
Author: Alexandra Morozova <email address hidden>
Date: Thu Dec 18 17:18:13 2014 +0100

    Hiding restricted pane in wizard

    DocImpact

    Closes-bug: #1402811

    Change-Id: I36d64c4a07065db473b6b4a452737d8028e59105

[Anastasia Palkina (apalkina)]

Verified on ISO #58

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