bay's name should be less than 255

[Eli Qiao]

We limit the bay's name to 255, but when we create a heat stack, we have the stack_name as:

stack_name = '%s-%s' % (bay.name, short_id.generate_id())

but in heat, we see that:

147 message = _('Invalid stack name %s must contain '
 148 'only alphanumeric or \"_-.\" characters, '
 149 'must start with alpha and must be 255 '
 150 'characters or less.') % name

the length of bay's name should be 255 - len(short_id.generate_id()) -1 = 255-12-1 = 242

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/347644

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/347644
Committed: https://git.openstack.org/cgit/openstack/magnum/commit/?id=e4a8242b96360cddbf3b5c7114e814af53aa9796
Submitter: Jenkins
Branch: master

commit e4a8242b96360cddbf3b5c7114e814af53aa9796
Author: Eli Qiao <email address hidden>
Date: Wed Jul 27 14:31:27 2016 +0800

    API: restrict length of bay's name to 242

    Restrict the length of bay's name to avoid passing a invalid long name
    to heat stack.

    Reason of 242 is:
    stack_name = '%s-%s' % (bay.name, short_id.generate_id())
    255 - len(short_id.generate_id()) - 1 = 242

    Closes-bug: #1606785
    Change-Id: If22a9018ece718f014c40e8059b945ae1a411f5b

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/magnum 3.0.0 release.