* Don't return module error when mysql_connect fails (#64560)
mysql_user expects an Exception when using check_implicit_admin.
* Adds integration tests for mysql_user check_implicit_admin (#64560)
This change corrects problems reported by the `yamllint` linter.
Since key duplication problems were removed in 4d48711, this commit
mainly fixes trailing spaces and extra empty lines at beginning/end of
files.
