Version bump to OPD1.170816.018

Change-Id: I4007ca5659763cc61388d9060381b5110512f4ed
diff --git a/core/build_id.mk b/core/build_id.mk
index dc28a79..c8c6f3a 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=OPD1.170816.017
+export BUILD_ID=OPD1.170816.018