Version bump to OPM2.171019.020

Change-Id: Ib009167e6f5a5222a3c6f4bad224c8fc55cbe4dc
diff --git a/core/build_id.mk b/core/build_id.mk
index 9a27de4..d5b1206 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=OPM2.171019.019
+export BUILD_ID=OPM2.171019.020