Remove deprecated mqtrigger with kind fission (#2875)

* Remove deprecated mqtrigger with kind fission
* Remove unused deps

---------

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

pkg/mqtrigger/messageQueue/messageQueue.go

@@ -1,36 +0,0 @@
-/*
-Copyright 2020 The Fission Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package messageQueue
-
-import (
-	fv1 "github.com/fission/fission/pkg/apis/core/v1"
-)
-
-type (
-	Subscription interface{}
-
-	Config struct {
-		MQType  string
-		Url     string
-		Secrets map[string][]byte
-	}
-
-	MessageQueue interface {
-		Subscribe(trigger *fv1.MessageQueueTrigger) (Subscription, error)
-		Unsubscribe(triggerSub Subscription) error
-	}
-)