Exclude vtn/sfcmgr from obs

Gerrit 5860 does not completely solve the problem.
Maven will still try to compile the folder without POM file and fail.

Change-Id: Id2a7e8a33f931e0b67882250f052968d734118c9
diff --git a/tools/dev/bin/onos-build-selective.exclude b/tools/dev/bin/onos-build-selective.exclude
index 1265494..487f848 100644
--- a/tools/dev/bin/onos-build-selective.exclude
+++ b/tools/dev/bin/onos-build-selective.exclude
@@ -6,4 +6,5 @@
 .*/cord-gui/.*
 .*/jdvue/.*
 .*/ovsdb/api/.*
-.*/netconf/flow/.*
\ No newline at end of file
+.*/netconf/flow/.*
+.*/vtn/sfcmgr/.*
\ No newline at end of file