Heat Stack name not validated

[Leandro Ignacio Costantino]

When creating a new stack, if the name does not start with [a-zA-Z] the creation fails with a generic message.

Ideally, we should add the same regexp used in Heat into the form to avoid an extra request just to fail and improve the error message.

Steps:
  1) Stack
  2) Create Stack ( use minimum template example )
  3) Name:
         2222_Stack or _Stack or ...Stack

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/58068

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/58068
Committed: http://github.com/openstack/horizon/commit/fd67686e1fe8147847d9580c6c327ce812b56a22
Submitter: Jenkins
Branch: master

commit fd67686e1fe8147847d9580c6c327ce812b56a22
Author: Leandro I. Costantino <email address hidden>
Date: Fri Nov 22 02:55:42 2013 -0500

    Heat Stack name is missing form validation.

    When creating a stack using Horizon, the form is missing name
    validation, so a generic error is shown whenever the name
    does not follow the regex used by Heat.
    ([a-zA-Z][a-zA-Z0-9_.-]*)
    Add server side validation and the right error message.

    Change-Id: I7a639bcf96b7c74760123b6106aab7d9311f5e2f
    Closes-Bug: #1254212