Manually merge PR186 to remove now unused imports after PR185 mainly in order to really get rid of the recently retired 'import crypt'

git-svn-id: svn+ssh://svn.code.sf.net/p/migrid/code/trunk@6203 b75ad72c-e7d7-11dd-a971-7dbc132099af

Author: jonasbardino

mig/shared/install.py

@@ -39,14 +39,10 @@
 
 import ast
 import base64
-import crypt
-import datetime
 import grp
 import os
 import pwd
-import random
 import re
-import socket
 import subprocess
 import sys