disable the old upgrade test - it can't work as things are

Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>

tests/upgrade_test.go

@@ -6,7 +6,11 @@ import (
 	. "gopkg.in/check.v1"
 )
 
-func (s *QemuSuite) TestUpgrade(c *C) {
+// DisabledTestUpgrade, The new go based installer code breaks downgrading from itself to a previous version
+// because 0.8.0 now uses syslinx and a set of syslinux.cfg files, whereas before that , we used grub and
+// assumed that there was only one kernel&initrd
+//      see installer_test.go for more tests
+func (s *QemuSuite) DisabledTestUpgrade(c *C) {
 	s.RunQemuInstalled(c)
 
 	s.CheckCall(c, `