Fix rax_find_loadbalancer issues

* Loadbalancer IDs are not UUIDs
* Ensure found list exists before using it

fixed ssh fix, bad test case but it should work now

added error handling on private key stat in case it is saved in agent

but not in filesystem

changed examples to not have a  non working variable

with directives as per #9264

add documentation for the delegate_to magic variable

Fix path to the integration tests in docsite

"tests/integration" -> "test/integration"

* Playbook
* TaskInclude

updated to latest core module

last

updated ref to core with updated cloud sublcases with __init__.py

Doc subcategory merge fix

now merge

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