docs: Added datastore_regex parameter for vcenter settings

[OpenStack Infra]

https://review.openstack.org/137554
commit 11c46539bcc851690a59af6e5cb45e0ee17aba14
Author: Stepan Rogov <email address hidden>
Date: Thu Nov 27 12:32:39 2014 +0300

    Added datastore_regex parameter for vcenter settings

    Docimpact
    Change-Id: I8e3201fbdf100d048bc051a12035735065a6a393
    closes-bug: #1388066

[Irina Povolotskaya (ipovolotskaya)]

I'dd add it here: http://docs.mirantis.com/openstack/fuel/fuel-5.1/user-guide.html#network-settings-vcenter-ug

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/137767

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/137767
Committed: https://git.openstack.org/cgit/stackforge/fuel-docs/commit/?id=9cd97f8d186bbc686339b7313931724d83b5bbad
Submitter: Jenkins
Branch: master

commit 9cd97f8d186bbc686339b7313931724d83b5bbad
Author: Irina Povolotskaya <email address hidden>
Date: Fri Nov 28 14:23:34 2014 +0300

    Adds Datastore regexp option to set for vCenter

    Since the Fuel web UI now enables setting Datastore regexp for vCenter,
    let's add a note about it in the User Guide.

    Change-Id: If9cef6761cc58b97b438e207e2faad590c421609
    Closes-Bug: 1396972