Adding test pom.xml for release prerequisite validation

Change-Id: Id6c88c134d85435d9036f9d139a6ed27e0a500f7
diff --git a/tools/build/onos-prepare-release b/tools/build/onos-prepare-release
index b174738..7d8f0db 100755
--- a/tools/build/onos-prepare-release
+++ b/tools/build/onos-prepare-release
@@ -32,3 +32,4 @@
 . $ONOS_ROOT/tools/build/envDefaults
 exec bash -i
 
+# TODO on exit, print "leaving directory"