Add a tripleo passthrough script to make the install from packages so that we can reuse more of the instack scripts

scripts/tripleo

@@ -0,0 +1,14 @@
+#!/usr/bin/python
+
+import os
+import subprocess
+import sys
+
+command = sys.argv[1:]
+instack_root = os.environ.get("INSTACK_ROOT", os.getcwd())
+command[0] = "%s/tripleo-incubator/scripts/%s" % (instack_root, command[0])
+
+os.environ["PATH"] = "%s/tripleo-incubator/scripts:%s" % \
+                        (instack_root, os.environ["PATH"])
+
+sys.exit(subprocess.call(command))