Make change and version bump to OPM4.171019.016

Change-Id: I4a280ddb87e09e4fcaf262e39cc4fb2129e6d542
diff --git a/core/build_id.mk b/core/build_id.mk
index 8750b1e..a1102dd 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=OPM2.171019.029
+export BUILD_ID=OPM4.171019.016