Yocto 2.4

Move OpenBMC to Yocto 2.4(rocko)

Tested: Built and verified Witherspoon and Palmetto images
Change-Id: I12057b18610d6fb0e6903c60213690301e9b0c67
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/import-layers/yocto-poky/bitbake/lib/bb/data.py b/import-layers/yocto-poky/bitbake/lib/bb/data.py
index 134afaa..80a7879 100644
--- a/import-layers/yocto-poky/bitbake/lib/bb/data.py
+++ b/import-layers/yocto-poky/bitbake/lib/bb/data.py
@@ -290,7 +290,7 @@
             return deps, value
         varflags = d.getVarFlags(key, ["vardeps", "vardepvalue", "vardepsexclude", "exports", "postfuncs", "prefuncs", "lineno", "filename"]) or {}
         vardeps = varflags.get("vardeps")
-        value = d.getVar(key, False)
+        value = d.getVarFlag(key, "_content", False)
 
         def handle_contains(value, contains, d):
             newvalue = ""