Add the beginnings of module documentation
Not that log_cfgs are not shown.
Add a link to the module code
Use bold for the internal name
Show the handle method for the cc_ubuntu_init_switch module
Make the cloud_init_modules look like a heredoc/inline heredoc
ChangeLog: update for last commit
Start adding cloud config module docs.

Add the basics of docs that can be extracted from the code itself (also
impose a initial format that will be useful for further modules to
follow). In this initial addition modify the cc_debug.py and
cc_ubuntu_init_switch.py to use this new style.