Use golang docker image for lnd_base

code/docker/lnd-base/Dockerfile

@@ -1,26 +1,6 @@
-FROM ubuntu:18.04
+FROM golang:1.13
 
-# Install development tools prerequisites
-RUN apt-get update && apt-get install -y \
-    build-essential \
-	libtool \
-	autotools-dev \
-	automake \
-	pkg-config \
-	python3 \
-	wget \
-	git \
-	curl \
-	unzip
-
-
-# Go 1.13 for LND
-RUN curl -SL https://dl.google.com/go/go1.13.linux-amd64.tar.gz \
-	| tar -xzC /usr/local
-ENV PATH $PATH:/usr/local/go/bin
-ENV GOPATH /gocode
-RUN mkdir -p $GOPATH
-ENV PATH $PATH:$GOPATH/bin
+WORKDIR /go/src/
 
 # LND
 RUN go get -d github.com/lightningnetwork/lnd