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.

Update constants.py so that one can specify environmental variable
ANSIBLE_SYSLOG_FACILITY or syslog_facility in ansible.cfg to define
the syslog facility to use.  Alternatively, you can specify
ansible_syslog_facility in inventory.  Runner now replaces
the syslog facility in the openlog() call with the default or
the injected variables ansible_syslog_facility.

This also updates hacking/test-module to behave similarly.

Refactored hacking/test-module

1. uses optparse

2. has --debugger option

tested only with pdb on Python 2.7

Added code to allow insertion of boilerplate into modules to make them able to share lots of code, the result
should be a huge reduction of total ansible source, at a slight cost of difficulty in original module development.

We need to apply this now to all modules, but may need to have some exemptions to things like command, which should
subclass this module.

Adding a missing '~' to use the user's home directory instead of the root file system for the module arguments

from modules remotely when they fail to parse, and this is VERY useful data.

treated -D as a way to show stderr, and make sure modules don't include things on stderr.
Update docs and test module script to come into line.

It works like this:

{{ hostvars['127.0.0.1']['ansible_eth0']['ipv4']['address'] }}