pungi: do not generate upgrade.img

We do not support in-place upgrades this way.

pungi/disable-upgrade.patch

@@ -0,0 +1,11 @@
+--- pungi-3.12/src/pypungi/__init__.py.orig	2015-03-23 13:24:45.173223580 +0100
++++ pungi-3.12/src/pypungi/__init__.py	2015-03-23 13:24:59.222835656 +0100
+@@ -1411,7 +1411,7 @@
+ 
+         lorax.run(self.ayum, product=product, version=version, release=release,
+                   variant=variant, bugurl=bugurl, isfinal=isfinal, domacboot=domacboot,
+-                  workdir=workdir, outputdir=outputdir)
++                  workdir=workdir, outputdir=outputdir, doupgrade=False)
+ 
+         # write out the tree data for snake
+         self.writeinfo('tree: %s' % self.mkrelative(self.topdir))

pungi/pungi.spec

@@ -17,6 +17,7 @@ Patch0:         support-verify-downloaded-packages.patch
 Patch1:         disable-efi.patch
 Patch2:         effective-nosource-option.patch
 Patch3:         fix-recursive-partition-table-on-iso-image.patch
+Patch4:         disable-upgrade.patch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 Requires:       yum => 3.4.3-28, repoview, createrepo >= 0.4.11
 Requires:       lorax
@@ -35,6 +36,7 @@ A tool to create anaconda based installation trees/isos of a set of rpms.
 %patch1 -p1
 %patch2 -p1
 %patch3 -p1
+%patch4 -p1
 
 %build
 %{__python} setup.py build