Fixes #7631

* the current state of the ELB was not reflected properly when checking
  the status after a change was made.
* invalid zones caused a traceback when enabling/disabling zones

Uses the new get_aws_connection_info
and connect_to_aws common methods to reuse code

Now complains if region is not set in one of the
three possible methods

Also moved over to common documentation code so
this is actually based on #6913

Scrub choices=BOOLEANS from remaining core module references.  Correct form in argument_spec is type='dict'.

When disabled, the boto connection will be instantiated without validating
the SSL certificate from the target endpoint. This allows the modules to connect
to Eucalyptus instances running with self-signed certs without errors.

Fixes #3978

Change standard AWS access and secret key parameter names to aws_access_key and aws_secret_key. Fixes an authentication problem with the rds module and standardizes the naming convention on something more encompassing than ec2_*_key.