Fix exception catching for Python 2.4

Make sure we get all data

add ec2 module

Addhost module

Add some python packages too

Add DNS TXT record $LOOKUP plugin

run - lets act on those hosts in the next play

Documentation of svr4pkg module breaks 'make rpm'

Without this fix, generating documentation results in:

```
Traceback (most recent call last):
  File "hacking/module_formatter.py", line 376, in <module>
    main()
  File "hacking/module_formatter.py", line 365, in main
    text = template.render(doc)
  File "/usr/lib64/python2.6/site-packages/jinja2/environment.py", line 669, in render
    return self.environment.handle_exception(exc_info, True)
  File "hacking/templates/man.j2", line 20, in top-level template code
    {% for desc in v.description %}@{ desc | jpfunc }@{% endfor %}
  File "hacking/module_formatter.py", line 94, in man_ify
    t = _ITALIC.sub(r'\\fI' + r"\1" + r"\\fR", text)
TypeError: expected string or buffer
```

Turn 'fail' and 'debug' modules into action_plugins

Add an "executable" option to the command and shell modules

Make --oneline return one line (except with multiline output)

Make module output more consistent wrt. changed/failed

Updates to git module: use git-fetch and other changes

Wrap getpwnam in try/except in authorized_key module

Handle instances without keypairs

Add svr4pkg module for traditional Solaris packages

Support scp in an ssh connection

When starting from scratch those packages must be installed too.

The option will be passed to the Popen object created and will be used to
execute the command instead of the default shell.

Currently the message prepared for --oneline mode adds a newline to the msg-string, which is then printed (adding another newline). This change removes the added newline so that successes and failures do not differ in output (except if the output is multiline).

- Make sure exit_json() always returns a changed= value
- Modify the yum module to not return failed=False
- Modify install() and latest() similar to remove() in yum module
- Changed exit_json(failed=True, **res) into a fail_json(**res)
- Make sure yum rc= value reflects loop (similar to how we fixed remove())

without a keypair, so this takes care of that scenario

This also adds module as an argument to keyfile().

Rewrote switch_version() to read .git/HEAD to find branch associated
with HEAD.  If in a detached HEAD state, will read
.git/refs/remotes/<remote>/HEAD.

Fix broken RPM names due to static _rpmfilename

Fix example where imported ssh keys contain spaces

Only print 'Invoked with' if there are arguments to the module

This fixes #1521