Support setting kernel commandline options under Grub0.

This adds support in bootload::grub0::kernel_option for setting
kernel commandline options, both "bare" options, and options with
values.  It uses Augeas with the Grub lens to handle this.

manifests/grub0/kernel_option.pp

@@ -24,16 +24,22 @@ define bootloader::grub0::kernel_option($ensure, $value)
     }
     elsif ($value == true or $value == false)
     {
-	# Detecting if the option is already present is not easily done
-	# using regexps...
-	fail("Bootloader::Grub0::Kernel_option[${title}]: ",
-	     "Setting a kernel option is not yet implemented.")
+	augeas {
+	    "bootloader::grub0::kernel_option::${name}":
+		incl => '/boot/grub/grub.conf',
+		lens => 'Grub.lns',
+		context => '/files/boot/grub/grub.conf',
+		changes => "setm title[*]/kernel ${name}";
+	}
     }
     else
     {
-	# Detecting if the option is already present is not easily done
-	# using regexps...
-	fail("Bootloader::Grub0::Kernel_option[${title}]: ",
-	     "Setting a kernel option is not yet implemented.")
+	augeas {
+	    "bootloader::grub0::kernel_option::${name}":
+		incl => '/boot/grub/grub.conf',
+		lens => 'Grub.lns',
+		context => '/files/boot/grub/grub.conf',
+		changes => "setm title[*]/kernel ${name} '${value}'";
+	}
     }
 }