Fix E402 (module level import not at top of file) pep8 errors
and no longer ignore new failures.
Trivialfix
Change-Id: If9a202f1f322b5b03966c692e33e94b7c872079b
This adds a new 'standardattributes' table and adds a foreign-key
references from ports, subnets, networks, subnetpools, routers,
securitygroups, and floatingips to this table.
This will make it easy to add new things to the schema like
timestamp fields or anything else that applies to multiple types
of Neutron resources. The new fields would just be added to the
'neutronresources' table instead of being duplicated across each
resource's table. Or, if the the relationship is 1-to-many (e.g. tags),
the new association table would be related to the 'standardattribute'
table.
Related-Bug: #1496802
Change-Id: Iaa3ba81a7e9cae09cea153720b29879d8cc9a080