By switching to block style (`|`) with clip (no `-` or `+`) the failure
messages don't require quoting and gain a single trailing newline. This causes
Ansible to print them as block style, when using the yaml stdout callback
plugin. As a result the values have one less layer of quoting and quote
escaping, making them much easier to read.
CI containers lack the necessary `setfacl` command. This has not previously
been noticed because no vanilla Ansible jobs were being run on Linux, only on
macOS.
refs #1118
Alex Willmer