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Updates to the authorized_key documentation

Add rhnreg_ks module

Simple zypper module to install, remove, or upgrades packages.

* Clarified the meaning of 'user'
* Changed 'sshdir' to 'path' in the example
  * 'sshdir' is used internally in the module, but the argument is 'path'
* Made the capitalization consistent in the descriptions

Also ...
 * When unregistering, first unsubscribe from all content

rhnreg_ks command allows users to manage registration to a Red Hat
Network (RHN) (e.g. rhn.redhat.com) server.  The moduel will also
interact with the specified RHN system via XMLRPC as needed.

Before proceeding with registration, the rhnreg_ks module will enable
the system to receive updates from RHN.  This involves enabling the
appropriate RHN yum plugin, as well as disabling an active
subscription-manager yum plugin.

Once enabled, the module will support the following operations:
 * configure
 * register
 * subscribe to custom child channels (see `rhn-channel` command)
 * unregister

Update changelog

The subscription_manager module acts as a wrapper to the command
'subscription-manager'.  The subscription-manager utility allows users
to manage RHN registration, subscription and yum repositories from the
Red Hat Entitlement platform.

Currently, this module supports the following sub-commands:
 * config
 * [un]register
 * subscribe

lineinfile example: /etc/host[s]

Facts for HP-UX

quick and dirty bugfix for irc module

Add info about apk-tools module to contrib.rst.

input, and the extra channel hash on join wasn't helping either.

Change a lineinfile example from /etc/host to /etc/hosts

fix AWS page heading styles for 'pending information'

Skip dotfile in hosts dirs