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/conf/sanity.conf b/import-layers/yocto-poky/meta/conf/sanity.conf
index dcf60b7..46bdbeb 100644
--- a/import-layers/yocto-poky/meta/conf/sanity.conf
+++ b/import-layers/yocto-poky/meta/conf/sanity.conf
@@ -3,7 +3,7 @@
 # See sanity.bbclass
 #
 # Expert users can confirm their sanity with "touch conf/sanity.conf"
-BB_MIN_VERSION = "1.31.2"
+BB_MIN_VERSION = "1.33.4"
 
 SANITY_ABIFILE = "${TMPDIR}/abi_version"