Also update rax to mirror meta value normalization from rax_meta

* Catch issues with invalid regions
* Ensure we send string only data as meta values in the rax module
* Add public_key/lookup example for rax_keypair
* Clean up import statements

Add extra_create_args and extra_client_args to rax module to support passing
advanced configuration options to client instantiation and server create calls.

The name parameter for search_opts is a regex string, so make sure we include start and end of string characters

Fix regex match, the printf match should work with 0 or more numeric padding characters, not 1 or more

rax module: improvements

cs.images.find(human_id= throws novaclient.exceptions.NotFound,
resulting in the try/except block with
image = cs.images.find(name=image)  being skipped. catching
novaclient.exception.NotFound allows images to be specified with the
human readable name.

Example:
  tasks:
    - name: Server build request
      local_action:
        module: rax
        region: DFW
        image: Ubuntu 12.04 LTS (Precise Pangolin)

Also, the import is placed after try: import pyrax, because pyrax
imports novaclient and should fail if novaclient is missing.

Add support to existing rax module to honor the wait (and wait_timeout)
parameters on delete operations.  This patch removes existing logic in favor of
the built-in pyrax.utils.wait_until method.

Both modules dealing with rax resources should use the same arguments
and environmental variables. The author of rax_clb_nodes did some things
better so sync rax with that effort.

Changed shebangs that use /usr/bin/env to use /usr/bin/python and therefore be compatible with the ansible_python_interpreter variable.

  Migrated all examples: in DOCUMENTATION=''' string to standalone EXAMPLES=''' string
  Added deprecation warning to moduledev.rst and remove deprecated example from it
  Fixed up a few typos and uppercased some acronyms.
  add consistency to how EXAMPLES are formatted

This should have never made it in.

We were comparing an int to a string and getting things wrong, so
idempotence was lost. This forces the comparison to be int.

Even though others are possible, fail early on unsupported ones.

Only list the services supported
Don't put in unncessary required: false
Use better formatting for the example

Files can be inserted during server creation (like a fully formed
authorized_keys file). This code allows that to happen.

Docs were updated for formatting, location, and to add the new entry for
files.

This library provides functionality for the Rackspace Public Cloud by
way of the official pyrax SDK (https://github.com/rackspace/pyrax). At
this time only the cloudservers service is functional. Instances can be
created or deleted. Idempotency is provided on matching instances with
the same name, flavor, image, and metadata values within a given
region.

pyrax usage does require a credentials file written out to hold username
and API key.  See pyrax documentation for details
(https://github.com/rackspace/pyrax/blob/master/docs/pyrax_doc.md)