Fix mysqldump ignoring errors (#403)

* Add schema and tables for the tests

* Add tests for full dump with and without compression

* Add test for distinct dump with and without compression

* Fix sh not seeing errors for command before the pipe

sh is missing the pipefail flag. We must use bash for this.

* Add cleanup to prevent the following tests from failing

* Fix fqcn in module_defaults

* Add changelog fragment

* Add check to the error message to ensure we captured the right one

* Add option to activate the fix on systems with bash

* Fix errors when data schema is already absent

* Update changelogs/fragments/fix-256-mysql_dump-errors.yml

Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>

* Add markup for commands in the documentation string

Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>

* Add markup and next release version in the documentation string

Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>

* Fix missing dependency for MySQL 8

* Add pipefail to tests of uncompressed dumps to enure it still works

* Fix "bash command not found" if pipefail is used for uncompressed dump

* Fix sanity pep8

* Document example of dump with pipefail

* Add dedpulication to command construct

Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>

Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>

tests/integration/targets/test_mysql_db/tasks/main.yml

@@ -63,3 +63,6 @@
   vars:
     db_name: "{{ item }}"
   loop: "{{ db_names }}"
+
+- name: Check errors from mysqldump are seen issue 256
+  ansible.builtin.include_tasks: issue_256_mysqldump_errors.yml