Comment 12 for bug 1541691

Reviewed: https://review.openstack.org/281143
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=8093549e58e1c2de03e29aefa5bf5d1d71f31324
Submitter: Jenkins
Branch: master

commit 8093549e58e1c2de03e29aefa5bf5d1d71f31324
Author: He Jie Xu <email address hidden>
Date: Wed Feb 17 16:26:19 2016 +0800

    Generate better validation error message when using name regexes

    There are some regexes used in the json-schema for complex string validation.
    When the validation failed, json-schema lib didn't generate a useful error
    info for the user, it shows the regex to the user. But regex is really
    unreadable for normal user. This patch override the default FormatChecker to
    support passed in custom error message. This required using custom format
    checker instead of using 'pattern'.

    Change-Id: Ie6d789e38f64e04a3a76618639c34d36591d6187
    Partial-Bug: #1541691