Tidy up imports

dulwich/server.py

@@ -19,8 +19,8 @@
 import SocketServer
 from dulwich.protocol import Protocol, ProtocolFile, TCP_GIT_PORT, extract_capabilities
 from dulwich.repo import Repo
-from dulwich.pack import PackData, Pack, write_pack_data
-import os, sha, tempfile
+from dulwich.pack import write_pack_data
+import tempfile
 
 class Backend(object):