Moving all references to proto v4

Change-Id: Idbb9119da7ddae136f7ffbbb783429c7e049b3ab
diff --git a/Makefile b/Makefile
index fc97114..ef53349 100644
--- a/Makefile
+++ b/Makefile
@@ -22,7 +22,7 @@
 VOLTHA_TOOLS_VERSION ?= 2.0.0
 
 PROTOC    = docker run --rm --user $$(id -u):$$(id -g) -v ${CURDIR}:/app $(shell test -t 0 && echo "-it") voltha/voltha-ci-tools:${VOLTHA_TOOLS_VERSION}-protoc protoc
-PROTOC_SH = docker run --rm --user $$(id -u):$$(id -g) -v ${CURDIR}:/go/src/github.com/opencord/voltha-protos/v3 $(shell test -t 0 && echo "-it") --workdir=/go/src/github.com/opencord/voltha-protos/v3 voltha/voltha-ci-tools:${VOLTHA_TOOLS_VERSION}-protoc sh -c
+PROTOC_SH = docker run --rm --user $$(id -u):$$(id -g) -v ${CURDIR}:/go/src/github.com/opencord/voltha-protos/v4 $(shell test -t 0 && echo "-it") --workdir=/go/src/github.com/opencord/voltha-protos/v4 voltha/voltha-ci-tools:${VOLTHA_TOOLS_VERSION}-protoc sh -c
 GO        = docker run --rm --user $$(id -u):$$(id -g) -v ${CURDIR}:/app $(shell test -t 0 && echo "-it") -v gocache:/.cache -v gocache-${VOLTHA_TOOLS_VERSION}:/go/pkg voltha/voltha-ci-tools:${VOLTHA_TOOLS_VERSION}-golang go
 
 # Function to extract the last path component from go_package line in .proto files