ginkgo: restructure install work flow

- move the ginkgo deps into test/tools which is more consitent with the
  other tools there, listing in dependencies always causes errors with
  linters
- do not install it globally on the system, instead we use it in a
  subdir of this project

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

test/tools/vendor/github.com/nxadm/tail/tail_posix.go

@@ -0,0 +1,17 @@
+// Copyright (c) 2019 FOSS contributors of https://github.com/nxadm/tail
+// +build !windows
+
+package tail
+
+import (
+	"os"
+)
+
+// Deprecated: this function is only useful internally and, as such,
+// it will be removed from the API in a future major release.
+//
+// OpenFile proxies a os.Open call for a file so it can be correctly tailed
+// on POSIX and non-POSIX OSes like MS Windows.
+func OpenFile(name string) (file *os.File, err error) {
+	return os.Open(name)
+}