Remove the -D module debug flag, which no longer is functional due to sudo pty requirements, and replace with -v/--verbose.

This flag will show playbook output from non-failing commands.  -v is also added to /usr/bin/ansible, but not  yet used.

I also gutted some internals code dealing with 'invocations' which allowed the callback to know what module invoked
it.  This is not something 0.5 does or needed, so callbacks have been simplified.

Since host variables are becoming important, it did not make sense to sustain --override-hosts, with the ability
to create hosts that didn't have inventory information, but also existed, in various groups.

This eliminates the creation of runner and playbook instances and just
invokes the processes ansible and ansible-playbook.

A first stab at a pull-based model for ansible.  This does two things:
    1. Invoke the git module via Runner to set up a git repository on the
       localhost.  It sets up Runner to use transport='local' and forces
       the inventory to just 'localhost'.
    2. Run any playbooks provided.  By default, this wants to run the
       playbook local.yml.  This also sets transport='local' and sets
       the host_list to a list: localhost, fqdn, and hostname.
The reason for setting the host_list and not using override_hosts is
because there may be plays in the playbook that are not meant for a
specific host.  That is, if the git repository is for the entire site
and not host-specific, you don't want to override hosts and apply all
plays to any given host.  This has the downside of potentially running a
play three times if the play is defined for 'hosts: all'.

ansible-playbook release-my-app.yml --extra-vars="version=123"

And make $version available in the playbook without re-editing the file

Runner() usage to the new inventory model.

remove --extra-vars since the new YAML inventory stuff wasn't quite using it as designed and it is getting hard to follow
with that and SETUP_CACHE etc

This introduces the Inventory class.

Playbook uses the internals of Runner to limit the number of hosts to poll
asynchronously. To accomodate this, Inventory can be restricted to specific
hosts.

Add support for specifying sudo passwords to both ansible & playbook.  Nopasswd sudo is no longer required.

Allow playbook to take --connection=local for easier reuse of playbook in kickstart w/o specifying connection: in
the playbook itself.  Both work.

interface.

add very small subclass of OptionParser to sort the options so mdehaan is happy

Added usage info to bin/ansible-playbook, now shows options on bare command line. NOTE: bin/ansible outputs usage to stdout, bin/ansible-playbook to stderr. Should they be consistent?

for other scripts to use.

d would be useful for --dry-run.

This prints remote module stderr on local stderr.