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/classes/metadata_scm.bbclass b/import-layers/yocto-poky/meta/classes/metadata_scm.bbclass
index 2e6fac2..fa791f0 100644
--- a/import-layers/yocto-poky/meta/classes/metadata_scm.bbclass
+++ b/import-layers/yocto-poky/meta/classes/metadata_scm.bbclass
@@ -26,7 +26,7 @@
     return "<unknown>"
 
 def base_get_scmbasepath(d):
-    return os.path.join(d.getVar('COREBASE', True), 'meta')
+    return os.path.join(d.getVar('COREBASE'), 'meta')
 
 def base_get_metadata_monotone_branch(path, d):
     monotone_branch = "<unknown>"