Make change and version bump to OPM4.171019.021.D1

Change-Id: I9dc71b866452c557d6aa8d6db492e15c72a282eb
diff --git a/core/build_id.mk b/core/build_id.mk
index f4c6477..1143eb0 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=OPM4.171019.021
+export BUILD_ID=OPM4.171019.021.D1