* vendor: Add gophercloud/routerinsertion package and update
gophercloud/firewall to support router insertion
* provider/openstack: Add support for associating
`openstack_fw_firewall_v1` resources with router(s).
Added `associated_routers` and `no_routers` arguments.
* website: Add documentation for `associated_routers`and `no_routers` arguments on `openstack_fw_firewall_v1` resource.
* provider/openstack: Add `AddValueSpecs` function and refactor existing
uses.
* provider/openstack: Detect Region for Importing Resources
This commit changes the way the OpenStack region is detected and set.
Any time a region is required, the region attribute will first be
checked. Next, the OS_REGION_NAME environment variable will be checked.
While schema.EnvDefaultFunc handles this same situation, it is not
applicable when importing resources.
* provider/openstack: No longer ignore region in importing tests
* provider/openstack: Network and Subnet Import Fixes
This commit fixes the OpenStack Network and Subnet resources so that
importing of those resources is successful.