remove config option iqn_prefix

The option iqn_prefix in xensever.py is not used anywhere in
the code base and should be removed.

Blueprint centralize-config-options-newton

Change-Id: I68301a98604b0fa64ef611923607e12798984825

nova/conf/xenserver.py

@@ -330,9 +330,6 @@ xenapi_opts = [
     cfg.StrOpt('target_port',
                default='3260',
                help='The iSCSI Target Port, default is port 3260'),
-    cfg.StrOpt('iqn_prefix',
-               default='iqn.2010-10.org.openstack',
-               help='IQN Prefix'),
     # NOTE(sirp): This is a work-around for a bug in Ubuntu Maverick,
     # when we pull support for it, we should remove this
     cfg.BoolOpt('remap_vbd_dev',

releasenotes/notes/remove-unused-config-opt-iqn_prefix-defb44120dae93e3.yaml

@@ -0,0 +1,5 @@
+---
+other:
+  - The XenServer configuration option 'iqn_prefix' has been removed.
+    It was not used anywhere and has no effect on any code, so there
+    should be no impact.