VOL-381 add unum container to support ONOS cluster formation under swarm

Change-Id: Ic260edda19bb199ed040f05164ab605f28c919d0
diff --git a/unum/vendor/github.com/mattn/go-isatty/doc.go b/unum/vendor/github.com/mattn/go-isatty/doc.go
new file mode 100644
index 0000000..17d4f90
--- /dev/null
+++ b/unum/vendor/github.com/mattn/go-isatty/doc.go
@@ -0,0 +1,2 @@
+// Package isatty implements interface to isatty
+package isatty