Version bump to OPM4.171019.015.A1

Change-Id: I97f9e1767d3edfd7c9554f526c3c7cdd091ac510
diff --git a/core/build_id.mk b/core/build_id.mk
index 0ddf9c3..37dd9f8 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=OPM4.171019.015
+export BUILD_ID=OPM4.171019.015.A1