The first call to persisting facts would work due to the assignment of a
MutableMapping calling __setitem__ but subsequent module fact data would
not be propogated to the fact cache plugins because update() doesn't
invoke __setitem__.  This changes the behavior a little bit and ensures
set() is called on cache plugins.

Also some pre-emptive python3 compat and a code simplification

fixes #12682

Fixes #12669

Fixes #12666

zabbix.py: Added additional ini file search path

update from origin

Update playbooks_blocks.rst

Remove heading that appears to be extraneous.

Indicate that credstash plugin is new in v2

Also offer a poor-man's alternative.

Displays the absolute path of a given task when verbosity is above level 3

Show a nice error if the role name is missing.

Explictly set the version of strict mode to use for powershell modules.

Add an example for map() to the filters page.

Fixes #12654

Fixes #12602

Fix ansible-vault rekey