template migration fails if version is integer

[Vijendar Komalla]

In the patch https://review.openstack.org/#/c/83241/ template migration script 043_migrate_template_versions.py assumes that template version would be a string. But it could be a non string value.
For example, it was observed that when the version was an integer value, DB migration was failing with 'TypeError' at
https://github.com/openstack/heat/blob/master/heat/db/sqlalchemy/migrate_repo/versions/043_migrate_template_versions.py#L46

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/83869

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/83869
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=f91569de61e6b91a2d6288c5f06f12d65946d80d
Submitter: Jenkins
Branch: master

commit f91569de61e6b91a2d6288c5f06f12d65946d80d
Author: Steven Dake <email address hidden>
Date: Fri Mar 28 12:29:26 2014 -0700

    version migration fails if version is an integer

    The migration 043 fails to account for the case where the version
    was specified as a string or version contains non-ascii characters.
    This breaks migration for folks that have those incorrect templatesx
     in their database.

    Change-Id: I9c2143c9d7a4d61ff41d32ee0f7b12a5640eec72
    Closes-bug: 1299174