VOL-2893 Removing redundant Dockerfile.

Change-Id: I8cc76c34bb82f476ca6b0f0fdeec93df9235cc07
diff --git a/docker/Dockerfile.rw_core b/docker/Dockerfile.rw_core
index 2877dee..19025c0 100644
--- a/docker/Dockerfile.rw_core
+++ b/docker/Dockerfile.rw_core
@@ -33,6 +33,8 @@
 COPY go.mod ./
 COPY go.sum ./
 
+ARG EXTRA_GO_BUILD_TAGS=""
+
 ARG org_label_schema_version=unknown
 ARG org_label_schema_vcs_url=unknown
 ARG org_label_schema_vcs_ref=unknown
@@ -43,7 +45,7 @@
 # Build
 WORKDIR /go/src/rw_core
 SHELL ["/bin/ash", "-o", "pipefail", "-c"]
-RUN go build -mod=vendor -o /go/bin/rw_core \
+RUN go build $EXTRA_GO_BUILD_TAGS -mod=vendor -o /go/bin/rw_core \
 	-ldflags \
 	"-X github.com/opencord/voltha-lib-go/v3/pkg/version.version=$org_label_schema_version \
 	 -X github.com/opencord/voltha-lib-go/v3/pkg/version.vcsRef=$org_label_schema_vcs_ref  \