HNAS: Mark NFS driver as unsupported

As per the message sent to the mailing list [1], the Hitachi NAS
Platform driver should be marked as unsupported.

[1]http://lists.openstack.org/pipermail/openstack/2017-March/018812.html
DocImpact

Change-Id: I2a56b43d818cd4828fb15dcec75b2af6adda5837

cinder/volume/drivers/hitachi/hnas_nfs.py

@@ -24,6 +24,7 @@ import socket
 from oslo_concurrency import processutils
 from oslo_config import cfg
 from oslo_log import log as logging
+from oslo_log import versionutils
 from oslo_utils import units
 import six
 
@@ -89,7 +90,12 @@ class HNASNFSDriver(nfs.NfsDriver):
     CI_WIKI_NAME = "Hitachi_HNAS_CI"
     VERSION = HNAS_NFS_VERSION
 
+    SUPPORTED = False
+
     def __init__(self, *args, **kwargs):
+        msg = _("The Hitachi NAS driver is deprecated and will be "
+                "removed in a future release.")
+        versionutils.report_deprecated_feature(LOG, msg)
         self._execute = None
         self.context = None
         self.configuration = kwargs.get('configuration', None)

releasenotes/notes/hnas-deprecate-nfs-driver-0d114bbe141b5d90.yaml

@@ -0,0 +1,5 @@
+---
+deprecations:
+  - The Hitachi NAS NFS driver has been marked as unsupported and is now
+    deprecated. enable_unsupported_driver will need to be set to True
+    in cinder.conf to continue to use it.