vm.install-debian: remove unused import

slapos/recipe/vm.py

@@ -25,7 +25,7 @@
 #
 ##############################################################################
 
-import base64, gzip, os, select, shutil, socket, stat
+import gzip, os, select, shutil, socket, stat
 import subprocess, sys, tempfile, threading, time
 from cStringIO import StringIO
 from collections import defaultdict