Fixed bug that occurred when pkgsite not specified

Update example to include delete on termination

Fix domain name in slack module

apt_repository: autoinstall python-apt if not available

Fixes #6557

A module for notifications through the Slack.com platform

add param to note example for ssh-keyscan

This fixes an issue related to the new run_command changes, whereby
Popen fails to run a command when an executable is specified + shell=False
and there are multiple positional arguments (see Popen docs for details)

homebrew: state=head includes --HEAD

hostnames in the known hosts file are typically stored as Hashed values, calling 'ssh-keyscan' with '-H' changes to output to the Hashed format so that the known_hosts file looks more consistent

Fixes #6546

Changes include:

 * Update Makefile to use credentials.yml when it exists
 * Add details on the use of the credentials.yml file to README.md.
 * Update credentials.template comments

Also, fixed a bug where the tags were being merged into the wrong
data structure (passed_vars) in _build_role_dependencies()

Fixes #6439
Fixes #5709

This module can send messages through Slack.com, and supports all options
available in the "incoming webhook integration".

- text
- channel
- username
- icon_url / icon_emoji
- link_names
- parse

allows for --HEAD to be included in brew install command

Fix for hostkey directory

Remove dependency on pycurl in apt_repository

Pass through vault_password when parsing host/group vars as directories.

Add space after full stop in ansible-galaxy help