Add tools for building deb packages to build_chroot

The chroot only had tools for building and testing Ganeti, but not for
building its Debian packages. They are added by this commit.
Signed-off-by: Michele Tartara <mtartara@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>

devel/build_chroot

@@ -203,6 +203,10 @@ in_chroot -- \
 in_chroot -- \
   cabal install --global shelltestrunner
 
+#Tools for creating debian packages
+in_chroot -- \
+  apt-get install python-docutils debhelper quilt
+
 #Set default editor
 in_chroot -- \
   update-alternatives --set editor $ALTERNATIVE_EDITOR