Add constant DEFAULT_MODULE_LANG that defaults to C. Can be set via environment variable ANSIBLE_MODULE_LANG or configuration variable module_lang. Updated test-module to have same behavior.
The 'env-setup' script modifies your environment to allow you to run
ansible from a git checkout.
To use it from the root of a checkout:
$ . ./hacking/env-setup
Note the space between the '.' and the './'