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/meta/classes/cml1.bbclass b/import-layers/yocto-poky/meta/classes/cml1.bbclass
index 38e6613..926747f 100644
--- a/import-layers/yocto-poky/meta/classes/cml1.bbclass
+++ b/import-layers/yocto-poky/meta/classes/cml1.bbclass
@@ -64,7 +64,8 @@
     if isdiff:
         statement = 'diff --unchanged-line-format= --old-line-format= --new-line-format="%L" ' + configorig + ' ' + config + '>' + fragment
         subprocess.call(statement, shell=True)
-
+        # No need to check the exit code as we know it's going to be
+        # non-zero, but that's what we expect.
         shutil.copy(configorig, config)
 
         bb.plain("Config fragment has been dumped into:\n %s" % fragment)