Load aliases

Only fallback to paramiko now when the ssh password has been set,
either through inventory or via a prompt.

Fixes #9470

Docs: accelerate mode -> accelerated mode

Setting keepalive option before opening session

Add the default Homebrew path for OpenSSL certs on OS X

vars_files haven't been discussed yet

The docs sometimes referred to "accelerated mode" as "accelerate mode".
This patch changes it to "accelerated mode" everywhere.

Setting the keepalive option before opening up the paramiko session
in order to avoid the slim chance that the connection is stalled
in the short time between opening the session and setting up the
keepalive. I described the issue I am solving at
https://groups.google.com/forum/#!topic/ansible-project/rkwvz3vyvLk

more intelligent about ignoring files that are clearly not modules

Also removing cruft code from earlier iteration on task.py and fixing
a bug where 'shell' was not removed from the task ds after munge()
cleaned things up

Also reworking tests to cut down on the number of patches required
by sub-classing the DataLoader() class and reworking the base object's
structure a bit to allow its use

something to show

function

added display of deprecated to ansible-doc
now it does better job of using tty columns
fixed indication truncation of desc with trailing ...
removed extension from module list, also fixed matching exlusion
blacklist

Update playbooks_variables.rst

As per yum module documents it state only support 'present, absent and latest'

Current intro doc is pointing older way of using yum module.