federation_client: clean up imports

synapse/federation/federation_client.py

@@ -14,29 +14,26 @@
 # limitations under the License.
 
 
+import copy
+import itertools
+import logging
+import random
+
 from twisted.internet import defer
 
-from .federation_base import FederationBase
 from synapse.api.constants import Membership
-
 from synapse.api.errors import (
     CodeMessageException, HttpResponseException, SynapseError,
 )
-from synapse.util import unwrapFirstError, logcontext
-from synapse.util.caches.expiringcache import ExpiringCache
-from synapse.util.logutils import log_function
-from synapse.util.logcontext import make_deferred_yieldable, preserve_fn
 from synapse.events import FrozenEvent, builder
+from synapse.federation.federation_base import FederationBase
 import synapse.metrics
-
+from synapse.util import logcontext, unwrapFirstError
+from synapse.util.caches.expiringcache import ExpiringCache
+from synapse.util.logcontext import make_deferred_yieldable, preserve_fn
+from synapse.util.logutils import log_function
 from synapse.util.retryutils import NotRetryingDestination
 
-import copy
-import itertools
-import logging
-import random
-
-
 logger = logging.getLogger(__name__)