Make change and version bump to OPR6.170623.016

Change-Id: I3bbeaa911fa062b2e455513a8a8cbad7979e11b0
diff --git a/core/build_id.mk b/core/build_id.mk
index 253ca19..7bf1222 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=OPR4.170623.006
+export BUILD_ID=OPR6.170623.016