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/lib/oeqa/buildperf/base.py b/import-layers/yocto-poky/meta/lib/oeqa/buildperf/base.py
index 6e62b27..7b2b4aa 100644
--- a/import-layers/yocto-poky/meta/lib/oeqa/buildperf/base.py
+++ b/import-layers/yocto-poky/meta/lib/oeqa/buildperf/base.py
@@ -485,6 +485,7 @@
     @staticmethod
     def sync():
         """Sync and drop kernel caches"""
+        runCmd2('bitbake -m', ignore_status=True)
         log.debug("Syncing and dropping kernel caches""")
         KernelDropCaches.drop()
         os.sync()