Version bump to OPR1.170623.018

Change-Id: I4be67fce4391a6e41339f7cf4f22f38db04733f8
diff --git a/core/build_id.mk b/core/build_id.mk
index 6643c8f..47c1465 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=OPR1.170623.017
+export BUILD_ID=OPR1.170623.018