service enable=on/off

Instead of one per host per polling cycle.

It wasn't killing the job at all before.
Indentation was 3 spaces.

Introduce group_names in template variables.

This is a list of all the groups a host is in.

from modules remotely when they fail to parse, and this is VERY useful data.

treated -D as a way to show stderr, and make sure modules don't include things on stderr.
Update docs and test module script to come into line.

This reverts commit 40f60353.

Revert "Revert "Actually wait for password prompt in remote sudo execution.  Totally breaks stderr debugging"

This reverts commit e1611403.

Conflicts:

	lib/ansible/connection.py

This reverts commit 44486223.

Revert "Actually wait for password prompt in remote sudo execution.  Totally breaks stderr debugging
and various modules.

This reverts commit 6341a954.

Some tweaks to first_available_file mostly in terms of error handling and not trying src= to be present
as it is not used here.

make it useful from /usr/bin/ansible and the API.  Also some minor style fixes.

first_if_available and yum fixes

add first_available_file look up to _execute_template and _execute_copy
to runner.

add this data to playbook handler so it can be included into module_vars

When running the service module via sudo, `$PATH` didn't contain `/sbin`,
so the service binary couldn't be found.  This just runs `/sbin/service`
directly.  Output is spewed to stderr on error.

Added `list=status` to include the output of `service <cmd> status`.

[devel] ansible-playbook hangs if not passed --extra-vars

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

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

Return the octal mode of a file instead of decimal.

Service module crashes if args has no "=".

Selinux -- more fun

Use socket.getfqdn() to fix issue #243

When running on lots of hosts with a large login banner on a slow network, it was still possible that the first recv() didn't to pull in the sudo password prompt, and sudo would fail intermittently.  This patch tells sudo to use a specific, randomly-generated prompt and then reads until it finds that prompt (or times out).  Only then is the password sent.  It also catches `socket.timeout` and thunks it to a more useful `AnsbileError` with the output of sudo so if something goes wrong you can see what's up.

This adds selinux_mls_enabled() and selinux_enabled() to detect a)
whether selinux is MLS aware (ie supports selevel) and b) whether
selinux is enabled.  If selinux is not enabled, all selinux operations
are punted on -- same as if python's selinux module were not available.
In set_context_if_different(), I now iterate over the current context
instead of the context argument.  Even if the system supports MLS, it
may not return the selevel from selinux.lgetfilecon().  Lastly, this
drops selinux_has_selevel() in lieu of the current approach.