This fixes handling of arguments (module argument) in service_control().
It is now locally scoped such that modifications to it, in the case of a
systemd host, do not later impact subsequent calls to service_control().
See issue #2449.

Without patch:
ansible-service[6177]: Command /usr/bin/systemctl stop cups cups , daemonize True

With patch:
ansible-service[6475]: Command /usr/bin/systemctl start cups , daemonize True

I also updated the comments to reflect the case where systemd is really
being called.

invalidate group cache when adding a new group

invalidate group cache so that a group added by the add_host module will be relfected in the groups variable in later plays.

Mention of ansible-doc and man pages for modules.

fail when service cannot be found by chkconfig

module_formatter.return_data: use UTF-8 encoding

The text parameter can contain non-ASCII characters, so we'll encode it
using UTF-8. For example the DOCUMENTATION of the bzr module has such
characters in the name of the author.

New Bazaar module

Make ec2 module idempotent with Amazon EC2 via client-token attribute.

lvg module for managing LVM volume groups

Add check mode to git module

check hostname presence

.my.cnf: default to login when no user specified

Document mysql_(user,db) login_unix_socket option

Added osrelease and osversion as well as changed the way sysctl is calle...

Teach the macports module to activate/deactivate packages

lvol patch for Debian Squeeze

Add nonunique option to user module, translating to the -o/--non-unique ...

added docs about in template overrides

Added variable expansion to task sudo_user parameter

pip module - run from the system's temp directory to avoid permissions problem

Add Homebrew module

nagios module: add common locactions of icinga.cfg

"nagios" module: fix NameError/'host' not defined

Basic groundwork for s3 module.

added vagrant module with cleanup

RPM packaging: check properly if using RHEL5 or older

Icinga should be compatible to Nagios (in our case the nagios module works well
with our Icinga installation)

Add missing 'host' variable, which is read a few lines later on in some cases.