Yocto 2.3

Move OpenBMC to Yocto 2.3(pyro).

Tested: Built and verified Witherspoon and Palmetto images
Change-Id: I50744030e771f4850afc2a93a10d3507e76d36bc
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Resolves: openbmc/openbmc#2461
diff --git a/import-layers/yocto-poky/meta/files/ext-sdk-prepare.py b/import-layers/yocto-poky/meta/files/ext-sdk-prepare.py
index 78c1d16..96c5212 100644
--- a/import-layers/yocto-poky/meta/files/ext-sdk-prepare.py
+++ b/import-layers/yocto-poky/meta/files/ext-sdk-prepare.py
@@ -53,6 +53,8 @@
         logf.write('Preparing SDK for %s...\n' % ', '.join(sdk_targets))
 
         ret = run_command_interruptible('BB_SETSCENE_ENFORCE=1 bitbake --quiet %s' % ' '.join(sdk_targets))
+        if not ret:
+            ret = run_command_interruptible('bitbake --quiet build-sysroots')
         lastlog = get_last_consolelog()
         if lastlog:
             with open(lastlog, 'r') as f: