Greg/localnet (#1450)

* Added new Makefile targets for local testnet running using docker

* Added localnode docker image description, some documentation and refactored to use the tendermint testnet command

* Fixes for the new tendermint testnet command

* More fixes on tendermint testnet and docker-compose

* Changed logging

* Added missing targets to phony

docker-compose/Makefile

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+# Makefile for the "localnode" docker image.
+
+all:
+	docker build --tag tendermint/localnode localnode
+
+.PHONY: all
+

docker-compose/README.rst

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+localnode
+=========
+
+It is assumed that you have already `setup docker <https://docs.docker.com/engine/installation/>`__.
+
+Description
+-----------
+Image for local testnets.
+
+Add the tendermint binary to the image by attaching it in a folder to the `/tendermint` mount point.
+
+It assumes that the configuration was created by the `tendermint testnet` command and it is also attached to the `/tendermint` mount point.
+
+Example:
+This example builds a linux tendermint binary under the `build/` folder, creates tendermint configuration for a single-node validator and runs the node:
+```
+cd $GOPATH/src/github.com/tendermint/tendermint
+
+#Build binary
+make build-linux
+
+#Create configuration
+docker run -e LOG="stdout" -v `pwd`/build:/tendermint tendermint/localnode testnet --o . --v 1
+
+#Run the node
+docker run -v `pwd`/build:/tendermint tendermint/localnode
+```
+
+Logging
+-------
+Log is saved under the attached volume, in the `tendermint.log` file. If the `LOG` environment variable is set to `stdout` at start, the log is not saved, but printed on the screen.
+
+Special binaries
+----------------
+If you have multiple binaries with different names, you can specify which one to run with the BINARY environment variable. The path of the binary is relative to the attached volume.
+
+docker-compose.yml
+==================
+This file creates a 4-node network using the localnode image. The nodes of the network are exposed to the host machine on ports 46656-46657, 46659-46660, 46661-46662, 46663-46664 respectively.
+

docker-compose/localnode/Dockerfile

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+FROM alpine:3.7
+MAINTAINER Greg Szabo <greg@tendermint.com>
+
+RUN apk update && \
+    apk upgrade && \
+    apk --no-cache add curl jq file && \
+    addgroup tmuser && \
+    adduser -S -G tmuser tmuser -h /tendermint
+
+USER tmuser
+VOLUME [ /tendermint ]
+WORKDIR /tendermint
+EXPOSE 46656 46657
+ENTRYPOINT ["/usr/bin/wrapper.sh"]
+CMD ["node", "--proxy_app dummy"]
+STOPSIGNAL SIGTERM
+
+COPY --chown=tmuser:tmuser wrapper.sh /usr/bin/wrapper.sh
+

docker-compose/localnode/wrapper.sh

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+#!/usr/bin/env sh
+
+##
+## Input parameters
+##
+BINARY=/tendermint/${BINARY:-tendermint}
+ID=${ID:-0}
+LOG=${LOG:-tendermint.log}
+
+##
+## Assert linux binary
+##
+if ! [ -f "${BINARY}" ]; then
+	echo "The binary `basename ${BINARY}` cannot be found. Please add the binary to the shared folder. Please use the BINARY environment variable if the name of the binary is not 'tendermint' E.g.: -e BINARY=tendermint_my_test_version"
+	exit 1
+fi
+BINARY_CHECK="`file $BINARY | grep 'ELF 64-bit LSB executable, x86-64'`"
+if [ -z "${BINARY_CHECK}" ]; then
+	echo "Binary needs to be OS linux, ARCH amd64"
+	exit 1
+fi
+
+##
+## Run binary with all parameters
+##
+export TMHOME="/tendermint/node${ID}"
+
+if [ -d "${TMHOME}/${LOG}" ]; then
+  "$BINARY" $@ | tee "${TMHOME}/${LOG}"
+else
+  "$BINARY" $@
+fi
+