Fix flake8, black and pylint errors in code

Change-Id: Ic03f4d31e2ba9801be20d3679bd5749948cab39d
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/osm_ee/frontend_grpc.py b/osm_ee/frontend_grpc.py
index b2b95d3..5bb0380 100644
--- a/osm_ee/frontend_grpc.py
+++ b/osm_ee/frontend_grpc.py
@@ -6,6 +6,7 @@
 
 import grpclib.const
 import grpclib.client
+
 if typing.TYPE_CHECKING:
     import grpclib.server
 
@@ -15,22 +16,28 @@
 class FrontendExecutorBase(abc.ABC):
 
     @abc.abstractmethod
-    async def RunPrimitive(self, stream: 'grpclib.server.Stream[osm_ee.frontend_pb2.PrimitiveRequest, osm_ee.frontend_pb2.PrimitiveReply]') -> None:
+    async def RunPrimitive(
+        self,
+        stream: "grpclib.server.Stream[osm_ee.frontend_pb2.PrimitiveRequest, osm_ee.frontend_pb2.PrimitiveReply]",
+    ) -> None:
         pass
 
     @abc.abstractmethod
-    async def GetSshKey(self, stream: 'grpclib.server.Stream[osm_ee.frontend_pb2.SshKeyRequest, osm_ee.frontend_pb2.SshKeyReply]') -> None:
+    async def GetSshKey(
+        self,
+        stream: "grpclib.server.Stream[osm_ee.frontend_pb2.SshKeyRequest, osm_ee.frontend_pb2.SshKeyReply]",
+    ) -> None:
         pass
 
     def __mapping__(self) -> typing.Dict[str, grpclib.const.Handler]:
         return {
-            '/osm_ee.FrontendExecutor/RunPrimitive': grpclib.const.Handler(
+            "/osm_ee.FrontendExecutor/RunPrimitive": grpclib.const.Handler(
                 self.RunPrimitive,
                 grpclib.const.Cardinality.UNARY_STREAM,
                 osm_ee.frontend_pb2.PrimitiveRequest,
                 osm_ee.frontend_pb2.PrimitiveReply,
             ),
-            '/osm_ee.FrontendExecutor/GetSshKey': grpclib.const.Handler(
+            "/osm_ee.FrontendExecutor/GetSshKey": grpclib.const.Handler(
                 self.GetSshKey,
                 grpclib.const.Cardinality.UNARY_UNARY,
                 osm_ee.frontend_pb2.SshKeyRequest,
@@ -44,13 +51,13 @@
     def __init__(self, channel: grpclib.client.Channel) -> None:
         self.RunPrimitive = grpclib.client.UnaryStreamMethod(
             channel,
-            '/osm_ee.FrontendExecutor/RunPrimitive',
+            "/osm_ee.FrontendExecutor/RunPrimitive",
             osm_ee.frontend_pb2.PrimitiveRequest,
             osm_ee.frontend_pb2.PrimitiveReply,
         )
         self.GetSshKey = grpclib.client.UnaryUnaryMethod(
             channel,
-            '/osm_ee.FrontendExecutor/GetSshKey',
+            "/osm_ee.FrontendExecutor/GetSshKey",
             osm_ee.frontend_pb2.SshKeyRequest,
             osm_ee.frontend_pb2.SshKeyReply,
         )