Nailgun unavailability dialog disappears right after appearance

[Vitaly Kramskikh]

After upgrading jQuery to v3, this dialog is not visible anymore. Probably it's related to changes in jQuery Promises.

[Bug Checker Bot (bug-checker)]

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[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/331109

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/331109
Committed: https://git.openstack.org/cgit/openstack/fuel-ui/commit/?id=5c0259e946dbed734b3bdf16727234c906c19182
Submitter: Jenkins
Branch: master

commit 5c0259e946dbed734b3bdf16727234c906c19182
Author: Vitaly Kramskikh <email address hidden>
Date: Fri Jun 17 13:11:04 2016 +0300

    Fix Nailgun unavailability dialog

    It was broken after upgrading jQuery to v3. It happend due to
    backwards-incompatible changes in deferreds handling:

    The resolution state of a Deferred created by .then() is now
    controlled by its callbacks - exceptions become rejection
    values and non-thenable returns become fulfillment values.
    Previously, returns from rejection handlers became rejection
    values.

    Now it's required to explicitly return rejected promise from
    rejection handler in app bootstrap promise chain.

    Closes-Bug: #1592788

    Change-Id: I2f1512fb421109bb9bc5063b7a314f5d53e16b1d