Convert the setup of ssl from a shell script to a

python module. This is in preparation for user
supplied certs.

ipa-python/ipautil.py

@@ -27,6 +27,7 @@ from random import Random
 from time import gmtime
 import os, sys, traceback, readline
 import stat
+import shutil
 
 from types import *
 
@@ -101,6 +102,15 @@ def dir_exists(filename):
     except:
         return False
 
+def install_file(fname, dest):
+    if file_exists(dest):
+        os.rename(dest, dest + ".orig")
+    shutil.move(fname, dest)
+
+def backup_file(fname):
+    if file_exists(fname):
+        os.rename(fname, fname + ".orig")
+
 class CIDict(dict):
     """
     Case-insensitive but case-respecting dictionary.