Cyclic import issue with use of common_types

[Manjeet Singh Bhatia]

We have defined some custom types in neutron/object/common_types
to better control and validate the input, but use of common_types in
objects/quota.py will lead to cyclic import like this

neutron.api.v2.base -> neutron.quota -> neutron.db.quota.api -> neutron.objects.quota -> neutron.objects.common_types -> neutron.extensions.dns -> neutron.extensions.l3 -> neutron.api.v2.resource_helper) (cyclic-import)

this is required to break for quota_ovo patch

https://review.openstack.org/#/c/338625/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/416352

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/416364
Committed: https://git.openstack.org/cgit/openstack/neutron-lib/commit/?id=73adf55f35211737b069e24dd42c97c7c2e46ac8
Submitter: Jenkins
Branch: master

commit 73adf55f35211737b069e24dd42c97c7c2e46ac8
Author: Manjeet Singh Bhatia <email address hidden>
Date: Tue Jan 3 22:23:25 2017 +0000

    Add FQDN_FIELD_SIZE constant

    FQDN_MAX_LEN has been defined at multiple locations
    in neutron tree, I encountered a situation where use
    of this constant from neutron/extensions/dns.py ended
    up in cyclic import. The better solution would be to
    have it in neutron lib and use it everywhere.

    Related-Bug: #1653780

    Change-Id: Ifd13f6d85bd7c7f5f803eaa8aac0e16c0f0edff7

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/416352
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=7d99bf0c8d575729eb5fe6ef1325a53eee23ed10
Submitter: Jenkins
Branch: master

commit 7d99bf0c8d575729eb5fe6ef1325a53eee23ed10
Author: Manjeet Singh Bhatia <email address hidden>
Date: Tue Jan 3 21:14:50 2017 +0000

    Break circular import with use of common_types

    Using UUIDFIelds from common types in objects/quota.py in [1],
    ended up in circular imports. This patch will fix it.

    [1]. https://review.openstack.org/#/c/338625/
    Change-Id: I67580a875d2a8c8a791b9e246c1247349c4771df
    Closes-Bug: #1653780

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 10.0.0.0b3 development milestone.