Added openflow/drivers to obs.exclude

Change-Id: I5854c872041a2224f6e6e73a029c6589b7894b34
diff --git a/tools/dev/bin/onos-build-selective.exclude b/tools/dev/bin/onos-build-selective.exclude
index 6cb40fe..ace399a 100644
--- a/tools/dev/bin/onos-build-selective.exclude
+++ b/tools/dev/bin/onos-build-selective.exclude
@@ -2,3 +2,4 @@
 .*/maven-plugin/.*
 .*/build/conf/.*
 .*/docs/.*
+.*/openflow/drivers/.*