Fix up some stuff from previous pull request

lib/vagrant/driver/virtualbox.rb

@@ -122,11 +122,11 @@ module Vagrant
         output = execute("--version")
         if output =~ /vboxdrv kernel module is not loaded/
           raise Errors::VirtualBoxKernelModuleNotLoaded
+        elsif output =~ /Please install/
           # Check for installation incomplete warnings, for example:
           # "WARNING: The character device /dev/vboxdrv does not
           # exist. Please install the virtualbox-ose-dkms package and
           # the appropriate headers, most likely linux-headers-generic."
-        elsif output =~ /Please install/
            raise Errors::VirtualBoxInstallIncomplete
         end
 

lib/vagrant/errors.rb

@@ -389,7 +389,7 @@ module Vagrant
     end
 
     class VirtualBoxInstallIncomplete < VagrantError
-      status_code(79)
+      status_code(80)
       error_key(:virtualbox_install_incomplete)
     end