Version bump to OPM2.171019.021

Change-Id: I48a93de175eb631c9e8854d721db4e59a7d2e949
diff --git a/core/build_id.mk b/core/build_id.mk
index d5b1206..3cfaad0 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=OPM2.171019.020
+export BUILD_ID=OPM2.171019.021