Move vmware_nsx/neutron/db to vmware_nsx/db

This is part of new vmware_nsx directory structure proposed in
https://goo.gl/GdWXyH.

Change-Id: I50468e8ecf81a636ac6a0f195c75b4bef25423b4

setup.cfg

@@ -28,7 +28,7 @@ data_files =
 console_scripts =
     neutron-check-nsx-config = vmware_nsx.neutron.plugins.vmware.check_nsx_config:main
 neutron.db.alembic_migrations =
-    vmware-nsx = vmware_nsx.neutron.db.migration:alembic_migrations
+    vmware-nsx = vmware_nsx.db.migration:alembic_migrations
 neutron.core_plugins =
     vmware = vmware_nsx.neutron.plugins.vmware.plugin:NsxMhPlugin
 neutron.service_plugins =

vmware_nsx/db/migration/alembic_migrations/env.py

@@ -24,7 +24,7 @@ from neutron.db.migration.alembic_migrations import external
 from neutron.db.migration.models import head  # noqa
 from neutron.db import model_base
 
-from vmware_nsx.neutron.db.migration import alembic_migrations
+from vmware_nsx.db.migration import alembic_migrations
 
 
 MYSQL_ENGINE = None

vmware_nsx/neutron/tests/functional/db/test_migrations.py

@@ -21,8 +21,8 @@ from neutron.db.migration import cli as migration
 from neutron.tests.common import base
 from neutron.tests.functional.db import test_migrations
 
-from vmware_nsx.neutron.db.migration import alembic_migrations
-from vmware_nsx.neutron.db.models import head
+from vmware_nsx.db.migration import alembic_migrations
+from vmware_nsx.db.models import head
 
 # EXTERNAL_TABLES should contain all names of tables that are not related to
 # current repo.