Fixes for su on freebsd

Make one fs function

directory

Fix typo in variable name

Replace CommandException with Exception

Don't double (or triple) up common error messages

This way we won't overwrite values that are stored in the inject
with module_vars that should be lower precedence.

Fixes #7510

process_common_errors() was called thrice, each time appending to the
existing error message, and leading to confusing repetition in the
message that was finally displayed.

Fixes #7498

Add `upgrade_all` option to homebrew module.

Addresses multiple issues when using su on freebsd including
* su prompt differs between platforms, so turned that check into a
  regex comparison instead of a simple string comparison
* not using '-c' after su causes problems, so added that for all
  platforms
* fixed quoting issues due to multiple uses of '-c' introduced by
  the above fix

Fixes #7503
Fixes #7507

Fix typo requird -> required

Add notes to rax_dns and rax_dns_record to recommend using serial: 1

Update django_manage `command` argument description

Don't use listify_ function, when all we want to do is template variable...

The docs were a little bit out of date with what commands are available to be run. They also didn't explain that you could pass custom commands - I almost went down the path of trying to run our custom management commands with the generic Ansible `command` module.

Fixes #7403

EC2: stopped instances can also be terminated

Merge branch 'multi-word-mysql-grant-example' of https://github.com/webmat/ansible into webmat-multi-word-mysql-grant-example

now module searches for update-alternatives vs hardcoding it

Since the filter list contains hosts, passing that back to list_hosts()
in the inventoy causes issues when the hostname is an IPv6 address
(with :'s interpreted as group unions). Since we already have the list
of hosts, we should not need to pass that back through inventory a
second time.

Fixes #7446