Rearrange the imports to meet the style guide

This also includes `from __future__ import absolute_import`
in every file so that the imports are consistent in Python 2 and 3.
The Python 2 tests fail without this.

tests/test_resolver/test_db.py

@@ -1,19 +1,20 @@
 # -*- coding: utf-8 -*-
 # SPDX-License-Identifier: MIT
+from __future__ import absolute_import
 import os
 
 from datetime import datetime
 from mock import patch, PropertyMock
 import pytest
 
-import module_build_service.resolver as mbs_resolver
 from module_build_service import conf, Modulemd
+from module_build_service.builder.MockModuleBuilder import load_local_builds
 from module_build_service.common import models
 from module_build_service.common.errors import UnprocessableEntity
 from module_build_service.common.models import ModuleBuild
 from module_build_service.common.utils import import_mmd, load_mmd, mmd_to_str
+import module_build_service.resolver as mbs_resolver
 from module_build_service.scheduler.db_session import db_session
-from module_build_service.builder.MockModuleBuilder import load_local_builds
 import tests
 
 

tests/test_resolver/test_koji.py

@@ -1,15 +1,17 @@
 # -*- coding: utf-8 -*-
 # SPDX-License-Identifier: MIT
-import pytest
-from mock import patch, MagicMock
+from __future__ import absolute_import
 from datetime import datetime
 
+from mock import patch, MagicMock
+import pytest
+
 from module_build_service import conf
 from module_build_service.common.models import ModuleBuild, BUILD_STATES
 from module_build_service.common.utils import import_mmd, load_mmd, mmd_to_str
 import module_build_service.resolver as mbs_resolver
-import tests
 from module_build_service.scheduler.db_session import db_session
+import tests
 
 
 @pytest.mark.usefixtures("reuse_component_init_data")

tests/test_resolver/test_local.py

@@ -1,13 +1,15 @@
 # -*- coding: utf-8 -*-
 # SPDX-License-Identifier: MIT
-import pytest
+from __future__ import absolute_import
 from datetime import datetime
 
+import pytest
+
 from module_build_service import conf
-from module_build_service.common.utils import import_mmd, load_mmd, mmd_to_str
-import module_build_service.resolver as mbs_resolver
-from module_build_service.scheduler.db_session import db_session
 from module_build_service.common.models import ModuleBuild
+from module_build_service.common.utils import import_mmd, load_mmd, mmd_to_str
+from module_build_service.scheduler.db_session import db_session
+import module_build_service.resolver as mbs_resolver
 import tests
 
 

tests/test_resolver/test_mbs.py

@@ -1,13 +1,15 @@
 # -*- coding: utf-8 -*-
 # SPDX-License-Identifier: MIT
+from __future__ import absolute_import
+
 from mock import patch, PropertyMock, Mock, call
 
 from module_build_service import app, conf
 from module_build_service.builder.MockModuleBuilder import load_local_builds
+import module_build_service.common.models
 from module_build_service.common.utils import load_mmd, mmd_to_str
 import module_build_service.resolver as mbs_resolver
 from module_build_service.scheduler.db_session import db_session
-import module_build_service.common.models
 import tests