added a note like the following to each file hit with unlabled 2.0 changes...
Ansible 2.0 moved away from using ansible_ssh_* variables to accepting
ansible_* variables. If you are using a version of Ansible prior to 2.0,
you should continue using the older style variables (ansible_ssh_*), such
as ansible_ssh_user instead of ansible_user and ansible_ssh_port instead of
ansible_port, which appear in the following content. These shorter variables
are ignored, without warning, in older versions of Ansible.

Fixes #12654

Fixes #12602

Fix ansible-vault rekey

Also does some reorganization/cleanup on the magic vars/delegated
variable generation portions of VariableManager to make the above
possible.

Fixes #12633

Galaxy

better error reporting on fetching errors
use scm if it exists over src
unified functions in requirements
simplified logic
added verbose to tests
cleanup code refs, unused options and dead code
moved get_opt to base class
fixes #11920
fixes #12612
fixes #10454

Fixes #12605

This is because we pass the whole dd command string into the shell
that's running on the contained environment rather than running it
directly from python via subprocess without a shell.

Add explicit substitution of relative paths on the remote host just in case the connection programs do something unexpected.

Fixes #12621

Fix url lookup plugin HTTPError message not being reachable

Since Connection.execute_command() returns bytes, deal with the repurcussions

corrected output from default callback
added new tests for no_log loops
updated makefile test to check for both positive and negative occurrences of no_log