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

@@ -11,9 +11,9 @@ REPO_PATH = github.com/deis/registry
 
 # The following variables describe the containerized development environment
 # and other build options
-DEV_ENV_IMAGE := quay.io/deis/go-dev:0.11.1
+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} ${DEV_ENV_IMAGE}
 LDFLAGS := "-s -w -X main.version=${VERSION}"
 BINDIR := ./rootfs/opt/registry/sbin