Version bump to OPR4.170623.016

Change-Id: I24bd5e74caa1120fedb74d31b451ce4abe6a2d04
diff --git a/core/build_id.mk b/core/build_id.mk
index 4f82c2d..4eb5180 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=OPR4.170623.015
+export BUILD_ID=OPR4.170623.016