Enable apt module to handle multiply packages (comma separated)

Issue755 - fixes for service module

Smiting Debian packaging instructions that did not work

them with the correct instructions. Changing file to .md to match 'docs'
file.

If _do_enable() is run and returns rc == 0, set changed=True
Add enabled and state to result if they are supplied when the module is
run.

Allow use of service module with just enable parameter, per issue #755.
Also fixed two other issues:
- fixed parameter to be 'enabled' per docs, not 'enable'.
- fixed if block that checks whether to run _do_enable() to check
  whether the parameter is set, not the value of the enable value which
  may be None or False.  If enabled=no, the service would never be
  disabled.

get_url except fix

Allow = symbols in variable values in host inventory

fixing test_one

on_skipped callback being passed an extra item parameter that it wasn't
expecting.
Fixed it so that on_skipped in TestCallbacks accepts and ignores the
extra parameter
Extra parameter was added in 4b9b9a8a
but not really clear why from commit message

Teach the common module code to warn users about typo'd arguments and also set everything to None automatically such
that code doesn't have to do a lot of params.get('foo', None) everywhere.

concatenating stdout and stderr in runner/__init__'s _low_level_exec_command

Apt module: add update-cache as alias of update_cache

This will ensure users of previous versions of this module don't
have their playbooks break.

Fixes for git module when it fails.

Allow copy dest argument to be a directory

Use sudo_user as an argument in the sudo command

Changed funtion name to get_ohai_data

added extra arguments for database creation

mysql_db: added 'encoding' and 'collation' args
postgresql_db: added 'owner', 'template' and 'encoding' args

Could have used shutil.copy rather than shutil.copyfile, but this
implementation preserves the md5 comparison to avoid unnecessary copies

* module.fail_json *must* have msg argument
Using http://github.com/ rather than git://github.com/ as it gets through more
firewalls

Port the file module over to the new common code infrastructure + cleanup some redundant imports since the module code already imports those things.

to scripted inventory so need to investigate this.