Refactored hacking/test-module

1. uses optparse

2. has --debugger option

tested only with pdb on Python 2.7

Using __slots__ in more places, in particular, hosts and groups, where we are apt to create a fair amount of objects.

Upgrading MySQL user module to new format

Tweaking daisychain internals to allow get_url to modify the path destination when downloading to a directory.
Minor module refactoring.

Remove this check as it wasn't really needed and in recent refinements keeps the group_vars stuff from working
as desired.

Update group module to use new shared module code

Upgrading mysql_db to new shared module code

	get module (with new module-magic-code!)
	Usage: ansible -m get -a "url=http://xxxxxxx  dest=fileordirctory"
	all cleanups as per @mpdehaan's suggestions
	add daisychain
	added example playbook (get_url.yml) with URLencode example

Script to migrate YAML users to the INI format, so we can deprecate YAML inventory (which we are now doing).

./group_vars/groupname.yml (for all groups the host is in)
./host_vars/hostname.yml (for the hostname given in the inventory)

This requires an actual inventory file, not script and the paths are relative
to the directory of the inventory file.

Skip get_ipv6_facts if socket.has_ipv6 is false

improved output in with_items fixes: #627

AnsibleModule now correctly reads param values with '"'.

Sanitize possible password argument when logging invocation

Fix for issue 604