Version bump to OPM2.170928.004

Change-Id: I2ad1718dc2b0df79f18f10fde9a7b7c623f73cee
diff --git a/core/build_id.mk b/core/build_id.mk
index fc2a7cc..8104589 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=OPM2.170928.003
+export BUILD_ID=OPM2.170928.004