Yocto 2.5

Move OpenBMC to Yocto 2.5(sumo)

Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Change-Id: I5c5ad6904a16e14c1c397f0baf10c9d465594a78
diff --git a/import-layers/meta-virtualization/recipes-devtools/python/python-pyyaml_3.11.bb b/import-layers/meta-virtualization/recipes-devtools/python/python-pyyaml_3.11.bb
index cb1db8c..ecb1719 100644
--- a/import-layers/meta-virtualization/recipes-devtools/python/python-pyyaml_3.11.bb
+++ b/import-layers/meta-virtualization/recipes-devtools/python/python-pyyaml_3.11.bb
@@ -25,6 +25,8 @@
 
 S = "${WORKDIR}/${SRCNAME}-${PV}"
 
+DEFAULT_PREFERENCE = "-1"
+
 inherit setuptools
 
 DEPENDS += "libyaml python-cython-native"