chore(Makefile): update to go-dev 0.17.0

Includes the go 1.7 toolchain. See https://tip.golang.org/doc/go1.7

Author: mboersma

Makefile

@@ -2,14 +2,11 @@ SHORT_NAME ?= builder
 
 include versioning.mk
 
-# Enable vendor/ directory support.
-export GO15VENDOREXPERIMENT=1
-
 # dockerized development environment variables
 REPO_PATH := github.com/deis/${SHORT_NAME}
-DEV_ENV_IMAGE := quay.io/deis/go-dev:0.16.0
+DEV_ENV_IMAGE := quay.io/deis/go-dev:0.17.0
 DEV_ENV_WORK_DIR := /go/src/${REPO_PATH}
-DEV_ENV_PREFIX := docker run --rm -e GO15VENDOREXPERIMENT=1 -v ${CURDIR}:${DEV_ENV_WORK_DIR} -w ${DEV_ENV_WORK_DIR}
+DEV_ENV_PREFIX := docker run --rm -v ${CURDIR}:${DEV_ENV_WORK_DIR} -w ${DEV_ENV_WORK_DIR}
 DEV_ENV_CMD := ${DEV_ENV_PREFIX} ${DEV_ENV_IMAGE}
 
 # Get the component informtation to a tmp location and get replica count