Version bump to OPM1.171019.021

Change-Id: Id98685938a63a4ba840fdbe6f7959e9c9247267e
diff --git a/core/build_id.mk b/core/build_id.mk
index 0006d90..9b8a073 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=OPM1.171019.020
+export BUILD_ID=OPM1.171019.021