VOL-2006 update voltha-api-server to use go mod

Change-Id: Ic9cce461175dd08cc4f30ddda2172640e8928b00
diff --git a/docker/Dockerfile.afrouterd b/docker/Dockerfile.afrouterd
index 91cf4fd..e8d3487 100644
--- a/docker/Dockerfile.afrouterd
+++ b/docker/Dockerfile.afrouterd
@@ -27,19 +27,14 @@
         protobuf-dev=3.6.1-r1
 
 # Prepare directory structure
-RUN mkdir -p /build \
-        "$GOPATH/src/" "$GOPATH/pkg" "$GOPATH/bin" \
-        "$GOPATH/src/github.com/opencord" \
-        "$GOPATH/src/github.com/opencord/voltha-api-server"
+RUN mkdir -p /build/src/arouterd \
+        "$GOPATH/src/" "$GOPATH/pkg" "$GOPATH/bin"
 
-WORKDIR $GOPATH/src/github.com/opencord/voltha-api-server
 
-# Copy common files.
-COPY vendor ./vendor
+WORKDIR /build/src/arouterd
 
-# Copy files
-COPY internal ./internal
-COPY cmd ./cmd
+# Copy source
+COPY . .
 
 # Copy config
 COPY arouter.json  /build
@@ -52,9 +47,8 @@
 ARG org_opencord_vcs_dirty=unknown
 
 # Build
-WORKDIR $GOPATH/src/github.com/opencord/voltha-api-server
 SHELL ["/bin/ash", "-o", "pipefail", "-c"]
-RUN go build -o /build/arouterd \
+RUN go build -mod=vendor -o /build/arouterd \
 	-ldflags \
 	"-X github.com/opencord/voltha-go/common/version.version=$org_label_schema_version \
 	 -X github.com/opencord/voltha-go/common/version.vcsRef=$org_label_schema_vcs_ref  \