Version bump to OPR2.170623.012

Change-Id: I3898b1c616201f9265045ad055a3e81297d48b13
diff --git a/core/build_id.mk b/core/build_id.mk
index 5f89e7f..29de714 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -18,4 +18,4 @@
 # (like "CRB01").  It must be a single word, and is
 # capitalized by convention.
 
-export BUILD_ID=OPR2.170623.011
+export BUILD_ID=OPR2.170623.012