using latest voltha-ci-tool container to correctly generate coverage reports

Change-Id: I0d16a3ea6be63d3487a6998f16ec4016553615c7
diff --git a/Makefile b/Makefile
index a4ad5ca..71ed349 100644
--- a/Makefile
+++ b/Makefile
@@ -48,11 +48,11 @@
 	--build-arg org_opencord_vcs_dirty="${DOCKER_LABEL_VCS_DIRTY}"
 
 # tool containers
-VOLTHA_TOOLS_VERSION ?= 2.0.0
+VOLTHA_TOOLS_VERSION ?= 2.3.1
 
 GO                = docker run --rm --user $$(id -u):$$(id -g) -v ${CURDIR}:/app -v gocache:/.cache -v gocache-${VOLTHA_TOOLS_VERSION}:/go/pkg voltha/voltha-ci-tools:${VOLTHA_TOOLS_VERSION}-golang go
 GO_JUNIT_REPORT   = docker run --rm --user $$(id -u):$$(id -g) -v ${CURDIR}:/app -i voltha/voltha-ci-tools:${VOLTHA_TOOLS_VERSION}-go-junit-report go-junit-report
-GOCOVER_COBERTURA = docker run --rm --user $$(id -u):$$(id -g) -v ${CURDIR}:/app -i voltha/voltha-ci-tools:${VOLTHA_TOOLS_VERSION}-gocover-cobertura gocover-cobertura
+GOCOVER_COBERTURA = docker run --rm --user $$(id -u):$$(id -g) -v ${CURDIR}:/app/src/github.com/opencord/voltha-openonu-adapter-go -i voltha/voltha-ci-tools:${VOLTHA_TOOLS_VERSION}-gocover-cobertura gocover-cobertura
 GOFMT             = docker run --rm --user $$(id -u):$$(id -g) -v ${CURDIR}:/app voltha/voltha-ci-tools:${VOLTHA_TOOLS_VERSION}-golang gofmt
 GOLANGCI_LINT     = docker run --rm --user $$(id -u):$$(id -g) -v ${CURDIR}:/app -v gocache:/.cache -v gocache-${VOLTHA_TOOLS_VERSION}:/go/pkg voltha/voltha-ci-tools:${VOLTHA_TOOLS_VERSION}-golangci-lint golangci-lint
 HADOLINT          = docker run --rm --user $$(id -u):$$(id -g) -v ${CURDIR}:/app voltha/voltha-ci-tools:${VOLTHA_TOOLS_VERSION}-hadolint hadolint