remove interpreter shbang lines from non-executables

thanks to Greg Troxel for the catch

src/allmydata/test/check_grid.py

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 """
 Test an existing Tahoe grid, both to see if the grid is still running and to
 see if the client is still compatible with it. This script is suitable for

src/allmydata/test/check_load.py

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 """
 this is a load-generating client program. It does all of its work through a
 given tahoe node (specified by URL), and performs random reads and writes

src/allmydata/test/check_memory.py

@@ -1,5 +1,3 @@
-#! /usr/bin/env python
-
 import os, shutil, sys, urllib, time, stat
 from cStringIO import StringIO
 from twisted.internet import defer, reactor, protocol, error

src/allmydata/test/check_speed.py

@@ -1,5 +1,3 @@
-#! /usr/bin/env python
-
 import os, sys
 from twisted.internet import reactor, defer
 from twisted.python import log

src/allmydata/test/test_base62.py

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 import random, unittest
 
 from allmydata.util import base62, mathutil

src/allmydata/util/base62.py

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 # from the Python Standard Library
 import string