Replace Mockery with Mock

Mockery requires all func's to be typed which can lead to some very annoying issues.
To avoid these issue testify mock will be replaced with github.com/golang/mock

Author: boekkooi-fresh

Gopkg.lock

@@ -1,5 +1,5 @@
 required = [
-  "github.com/vektra/mockery/cmd/mockery"
+  "github.com/golang/mock/mockgen"
 ]
 
 [[override]]
@@ -14,6 +14,10 @@ required = [
   name = "github.com/stretchr/testify"
   version = "^1.2.2"
 
+[[constraint]]
+  name = "github.com/golang/mock"
+  version = "^1.2.0"
+
 [[constraint]]
   name = "github.com/sirupsen/logrus"
   version = "^1.0.6"