Fixed the typo of the image name.
According to the definition in constants.sh and running behavior, default image name is 1.8.
#!/bin/bash
-# This starts a Docker container using the release image (openshift/origin-release:golang-1.6)
+# This starts a Docker container using the release image (openshift/origin-release:golang-1.8)
# and syncs the local directory into that image. The default mode performs a 'git archive' of
# the current HEAD, so you get a reproducible environment. You can also set
# OS_BUILD_ENV_REUSE_VOLUME to a docker volume name to rsync (or docker cp) the contents of
