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_client.py b/osm_ee/frontend_client.py
index 0c34580..21203a2 100644
--- a/osm_ee/frontend_client.py
+++ b/osm_ee/frontend_client.py
@@ -24,13 +24,11 @@
 import yaml
 import asyncio
 import uuid
-import traceback
-import os
 import socket
 
 from grpclib.client import Channel
 
-from osm_ee.frontend_pb2 import PrimitiveRequest, PrimitiveReply
+from osm_ee.frontend_pb2 import PrimitiveRequest
 from osm_ee.frontend_pb2 import SshKeyRequest, SshKeyReply
 from osm_ee.frontend_grpc import FrontendExecutorStub
 
@@ -42,7 +40,7 @@
     try:
         stub = FrontendExecutorStub(channel)
 
-        if (primitive_name == "get_ssh_key"):
+        if primitive_name == "get_ssh_key":
             print("Get ssh key")
             reply: SshKeyReply = await stub.GetSshKey(SshKeyRequest())
             print(reply.message)
@@ -51,22 +49,25 @@
                 primitive_id = str(uuid.uuid1())
                 print("Execute primitive {}, params: {}".format(primitive_name, params))
                 await stream.send_message(
-                    PrimitiveRequest(id=primitive_id, name=primitive_name, params=yaml.dump(params)), end=True)
+                    PrimitiveRequest(
+                        id=primitive_id, name=primitive_name, params=yaml.dump(params)
+                    ),
+                    end=True,
+                )
                 async for reply in stream:
                     print(reply)
-                #replies = [reply async for reply in stream]
-                #print(replies)
+                # replies = [reply async for reply in stream]
+                # print(replies)
     except Exception as e:
         print("Error executing primitive {}: {}".format(primitive_name, str(e)))
-        #print(traceback.format_exc())
     finally:
         channel.close()
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
 
     args = sys.argv[1:]
-    if (len(args) < 1):
+    if len(args) < 1:
         print("Usage: host port primitive_name params")
     else:
         host_name = args[0]
@@ -79,7 +80,9 @@
 
         loop = asyncio.get_event_loop()
         try:
-            task = asyncio.ensure_future(frontend_client(host_name, port, primitive_name, params))
+            task = asyncio.ensure_future(
+                frontend_client(host_name, port, primitive_name, params)
+            )
             loop.run_until_complete(task)
         finally:
             loop.close()