VOL-1460 Updated core to use voltha-protos instead of local protos
Moved protos to python directory in order to maintain functionaly of containers built there.
Added capability to do local builds of protos
Added instructions on running dep ensure for getting protos.
Updated github.com/golang/protobuf version to v1.3.1

Change-Id: Ia6ef55f07f0d5dcb5b750d7c37b21b71db85bfc4
diff --git a/tests/afrouter/suites/test1.json b/tests/afrouter/suites/test1.json
index 77cc0ec..3634f99 100644
--- a/tests/afrouter/suites/test1.json
+++ b/tests/afrouter/suites/test1.json
@@ -3,7 +3,7 @@
 		"cmdLine":"afrouter -logLevel 1 -config arouter_test.json",
 		"protoFiles": [
 			{
-				"importPath":"github.com/opencord/voltha-go/protos/",
+				"importPath":"github.com/opencord/voltha-protos/go/",
 				"service":"VolthaService",
 				"package":"voltha"
 			},
diff --git a/tests/afrouter/suites/test2.tmpl.json b/tests/afrouter/suites/test2.tmpl.json
index c8d040e..1355068 100644
--- a/tests/afrouter/suites/test2.tmpl.json
+++ b/tests/afrouter/suites/test2.tmpl.json
@@ -3,7 +3,7 @@
 		"cmdLine":"afrouter -config arouter_test.json -logLevel 1",
 		"protoFiles": [
 			{
-				"importPath":"github.com/opencord/voltha-go/protos/",
+				"importPath":"github.com/opencord/voltha-protos/go/",
 				"service":"VolthaService",
 				"package":"voltha"
 			},
diff --git a/tests/core/api/grpc_nbi_api_handler_client_test.go b/tests/core/api/grpc_nbi_api_handler_client_test.go
index ef0defa..47e4472 100644
--- a/tests/core/api/grpc_nbi_api_handler_client_test.go
+++ b/tests/core/api/grpc_nbi_api_handler_client_test.go
@@ -21,9 +21,9 @@
 	com "github.com/opencord/voltha-go/adapters/common"
 	"github.com/golang/protobuf/ptypes/empty"
 	"github.com/opencord/voltha-go/common/log"
-	"github.com/opencord/voltha-go/protos/common"
-	"github.com/opencord/voltha-go/protos/openflow_13"
-	"github.com/opencord/voltha-go/protos/voltha"
+	"github.com/opencord/voltha-protos/go/common"
+	"github.com/opencord/voltha-protos/go/openflow_13"
+	"github.com/opencord/voltha-protos/go/voltha"
 	"github.com/stretchr/testify/assert"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
diff --git a/tests/core/concurrency/core_concurrency_test.go b/tests/core/concurrency/core_concurrency_test.go
index d781ffc..42f5de0 100644
--- a/tests/core/concurrency/core_concurrency_test.go
+++ b/tests/core/concurrency/core_concurrency_test.go
@@ -23,8 +23,8 @@
 	"github.com/google/uuid"
 	com "github.com/opencord/voltha-go/adapters/common"
 	"github.com/opencord/voltha-go/common/log"
-	"github.com/opencord/voltha-go/protos/common"
-	"github.com/opencord/voltha-go/protos/voltha"
+	"github.com/opencord/voltha-protos/go/common"
+	"github.com/opencord/voltha-protos/go/voltha"
 	"github.com/stretchr/testify/assert"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/metadata"
diff --git a/tests/kafka/kafka_client_test.go b/tests/kafka/kafka_client_test.go
index 12f0ae4..b4fc0cf 100644
--- a/tests/kafka/kafka_client_test.go
+++ b/tests/kafka/kafka_client_test.go
@@ -22,7 +22,7 @@
 	"github.com/google/uuid"
 	"github.com/opencord/voltha-go/common/log"
 	kk "github.com/opencord/voltha-go/kafka"
-	ic "github.com/opencord/voltha-go/protos/inter_container"
+	ic "github.com/opencord/voltha-protos/go/inter_container"
 	"github.com/stretchr/testify/assert"
 	"os"
 	"testing"
diff --git a/tests/kafka/kafka_inter_container_messaging_test.go b/tests/kafka/kafka_inter_container_messaging_test.go
index de97558..d6a8e8b 100644
--- a/tests/kafka/kafka_inter_container_messaging_test.go
+++ b/tests/kafka/kafka_inter_container_messaging_test.go
@@ -21,8 +21,8 @@
 	"github.com/google/uuid"
 	"github.com/opencord/voltha-go/common/log"
 	kk "github.com/opencord/voltha-go/kafka"
-	ic "github.com/opencord/voltha-go/protos/inter_container"
-	"github.com/opencord/voltha-go/protos/voltha"
+	ic "github.com/opencord/voltha-protos/go/inter_container"
+	"github.com/opencord/voltha-protos/go/voltha"
 	rhp "github.com/opencord/voltha-go/rw_core/core"
 	"github.com/stretchr/testify/assert"
 	"os"