Put possible_topdir back in nova-api.

bin/nova-api

@@ -23,8 +23,14 @@ Starts both the EC2 and OpenStack APIs in separate processes.
 
 """
 
+import os
 import sys
 
+possible_topdir = os.path.normpath(os.path.join(os.path.abspath(
+        sys.argv[0]), os.pardir, os.pardir))
+if os.path.exists(os.path.join(possible_topdir, "nova", "__init__.py")):
+    sys.path.insert(0, possible_topdir)
+
 import nova.service
 import nova.utils