Use shutil to copy file

Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>

ipaclient/install/client.py

@@ -21,6 +21,7 @@ import gssapi
 import netifaces
 import os
 import SSSDConfig
+import shutil
 import socket
 import sys
 import tempfile
@@ -641,9 +642,9 @@ def configure_krb5_conf(
     # templating, but that could be changed in the future.
     template = os.path.join(
         paths.USR_SHARE_IPA_DIR,
-        os.path.basename(paths.KRB5_FREEIPA) + ".template")
-    contents = open(template).read()
-    open(paths.KRB5_FREEIPA, "w+").write(contents)
+        os.path.basename(paths.KRB5_FREEIPA) + ".template"
+    )
+    shutil.copy(template, paths.KRB5_FREEIPA)
     os.chmod(paths.KRB5_FREEIPA, 0x644)
 
     # Then, perform the rest of our configuration into krb5.conf itself.