remove several leftover defintions of netstring()

src/allmydata/download.py

@@ -569,9 +569,6 @@ class FileDownloader:
         return self._output.finish()
 
 
-def netstring(s):
-    return "%d:%s," % (len(s), s)
-
 class FileName:
     implements(IDownloadTarget)
     def __init__(self, filename):

src/allmydata/encode.py

@@ -10,9 +10,6 @@ from allmydata.util.assertutil import _assert
 from allmydata.codec import CRSEncoder
 from allmydata.interfaces import IEncoder
 
-def netstring(s):
-    return "%d:%s," % (len(s), s)
-
 """
 
 The goal of the encoder is to turn the original file into a series of

src/allmydata/test/test_encode.py

@@ -9,9 +9,6 @@ from allmydata.uri import pack_uri
 from allmydata.Crypto.Cipher import AES
 from cStringIO import StringIO
 
-def netstring(s):
-    return "%d:%s," % (len(s), s)
-
 class FakePeer:
     def __init__(self, mode="good"):
         self.ss = FakeStorageServer(mode)

src/allmydata/upload.py

@@ -254,9 +254,6 @@ class FileUploader:
                         )
 
 
-def netstring(s):
-    return "%d:%s," % (len(s), s)
-
 class FileName:
     implements(IUploadable)
     def __init__(self, filename):