Modernize number literals

Use Python-3 compatible syntax, without breaking compatibility with py 2.7

- Octals literals start with 0o to prevent confusion
- The "L" at the end of large int literals is not required as they use
  long on Python 2 automatically.
- Using 'int' instead of 'long' for small numbers is OK in all cases except
  strict type checking checking, e.g. type(0).

https://fedorahosted.org/freeipa/ticket/4985

Reviewed-By: Jan Cholasta <jcholast@redhat.com>

ipaserver/install/krbinstance.py

@@ -317,7 +317,7 @@ class KrbInstance(service.Service):
     def __add_default_acis(self):
         self._ldap_mod("default-aci.ldif", self.sub_dict)
 
-    def __template_file(self, path, chmod=0644):
+    def __template_file(self, path, chmod=0o644):
         template = os.path.join(ipautil.SHARE_DIR, os.path.basename(path) + ".template")
         conf = ipautil.template_file(template, self.sub_dict)
         self.fstore.backup_file(path)
@@ -399,7 +399,7 @@ class KrbInstance(service.Service):
 
         # Make sure access is strictly reserved to root only for now
         os.chown(paths.KRB5_KEYTAB, 0, 0)
-        os.chmod(paths.KRB5_KEYTAB, 0600)
+        os.chmod(paths.KRB5_KEYTAB, 0o600)
 
         self.move_service_to_host(host_principal)