Use Augeas to manage (remove) Grub0 kernel options.

Augeas knows the grammar for the Grub0 config file, so we don't need
to have complicated regular expressions in our code to deal with all
the corner cases.

manifests/grub0/kernel_option.pp

-# Copyright © 2017   Thomas Bellman, Linköping, Sweden
+# Copyright © 2017-2018   Thomas Bellman, Linköping, Sweden
 # Licensed under the GNU LGPL v3+; see the README file for more information.
 
 
@@ -7,18 +7,14 @@
  */
 define bootloader::grub0::kernel_option($ensure, $value)
 {
-    $prefix = '^(\s*kernel\s(|.*\s))'
-    $suffix = '(|\s.*)$'
-    $qname = regexp_quote($name)
-
     if ($ensure == 'absent')
     {
-	regexp_replace_lines {
+	augeas {
 	    "bootloader::grub0::kernel_option::${name}":
-		file => '/boot/grub/grub.conf',
-		pattern => "${prefix}${qname}(=\\S*)?${suffix}",
-		# \1 is prefix, \4 is suffix
-		replacement => '\1\4';
+		incl => '/boot/grub/grub.conf',
+		lens => 'Grub.lns',
+		context => '/files/boot/grub/grub.conf',
+		changes => "rm title[*]/kernel/${name}";
 	}
     }
     elsif ($ensure != 'present')