Handle the vulnerability in black duck report

Change-Id: Id4b96e8a25b14dbe057fc3595a9265fdda16622e
diff --git a/vendor/github.com/gorilla/mux/.gitignore b/vendor/github.com/gorilla/mux/.gitignore
new file mode 100644
index 0000000..84039fe
--- /dev/null
+++ b/vendor/github.com/gorilla/mux/.gitignore
@@ -0,0 +1 @@
+coverage.coverprofile