check one file for syntax and rm params fixes #223

[tdlc]

Before that all sudoers files were checked for
syntax and when an application would have
created a suders file with a permission/syntax
error the file managed by puppet would be deleted. But the file managed by puppet would not have a
syntax error.
This could also occur if an application creates
a file with permission 0400 instead of 0440 which
is demanded by visudo.
Removed delete_on_error: Now puppet will not
create the file if it has a syntax error by
default. Before that, syntax / permission
errors in other files would also lead to
deletion or error which makes no sense.
Removed validate_single: Previously all
files were always validated no matter which
value validate_single had. This makes no
sense, so remove parameter.
Removed conf parameter sudo_syntax_path as
the exec that used it was removed. Validation
is now only via validate_cmd of the puppet
file resource.

[saz]

I don't understand what makes you think that validate_single isn't checking only one file? For me, everything's looking correct with both options.

If validate_single is set to true, it will run visudo -c -f % as validate_cmd off the file resource which manages the file.