Fix flake8 warnings on flake8-import-order>0.19.0

This patch addresses the issues related to the new TYPE_CHECKING
style check "I300" introduced in flake8-import-order version 0.19.0
and later.

Change-Id: I3a442308e031e0c206c82d34ee4516ac6cc21656

cinder/api/api_utils.py

@@ -23,12 +23,12 @@ from oslo_utils import strutils
 import webob
 from webob import exc
 
-if typing.TYPE_CHECKING:
-    # conditional import to avoid a circular import problem from cinderlib
-    from cinder import context
 from cinder import exception
 from cinder.i18n import _
 
+if typing.TYPE_CHECKING:
+    from cinder import context
+
 CONF = cfg.CONF
 CONF.import_group('keystone_authtoken',
                   'keystonemiddleware.auth_token.__init__')

cinder/api/common.py

@@ -28,11 +28,11 @@ import webob
 from cinder.api import api_utils
 from cinder.api import microversions as mv
 from cinder.common import constants
-if typing.TYPE_CHECKING:
-    from cinder import context
 from cinder import exception
 from cinder.i18n import _
 
+if typing.TYPE_CHECKING:
+    from cinder import context
 
 api_common_opts = [
     cfg.IntOpt('osapi_max_limit',

cinder/cmd/backup.py

@@ -44,8 +44,6 @@ from oslo_log import log as logging
 from oslo_privsep import priv_context
 from oslo_reports import guru_meditation_report as gmr
 from oslo_reports import opts as gmr_opts
-if typing.TYPE_CHECKING:
-    import oslo_service
 
 # Need to register global_opts
 from cinder.common import config  # noqa
@@ -57,6 +55,8 @@ from cinder import service
 from cinder import utils
 from cinder import version
 
+if typing.TYPE_CHECKING:
+    import oslo_service
 
 CONF = cfg.CONF
 

cinder/cmd/volume.py

@@ -48,8 +48,6 @@ from oslo_log import log as logging
 from oslo_privsep import priv_context
 from oslo_reports import guru_meditation_report as gmr
 from oslo_reports import opts as gmr_opts
-if typing.TYPE_CHECKING:
-    import oslo_service
 
 # Need to register global_opts
 from cinder.common import config  # noqa
@@ -64,6 +62,9 @@ from cinder import service
 from cinder import utils
 from cinder import version
 
+if typing.TYPE_CHECKING:
+    import oslo_service
+
 CONF = cfg.CONF
 
 host_opt = cfg.StrOpt('backend_host', help='Backend override of host value.')