Update build toolchain to the use of docker…

… for integration tests.

- Update circle.yml to start the docker daemon listening on TCP (to be
  able to talk to it from the container running test-integration)
- Update script/test-integration to prepare the use of go-check
- Update Makefile in order to run less "binary" target and setting up
  the right environment variable for the builds

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

script/make.sh

@@ -4,6 +4,7 @@ set -e
 # List of bundles to create when no argument is passed
 DEFAULT_BUNDLES=(
 	validate-gofmt
+	validate-govet
 	binary
 
 	test-unit