Dell EMC: Deprecate VNX driver

... because VNX already reached its EOL.

Change-Id: I1d6b2bfd7d99295f30fd9028771c8c4e7bd6b65f

doc/source/admin/emc_vnx_driver.rst

@@ -30,6 +30,11 @@ This driver performs the operations on VNX by XMLAPI and the File command line.
 Each backend manages one Data Mover of VNX. Multiple manila backends need to
 be configured to manage multiple Data Movers.
 
+.. note::
+
+   Dell EMC VNX driver has been deprecated and will be removed in a future
+   release
+
 Requirements
 ------------
 

doc/source/configuration/shared-file-systems/drivers/dell-emc-vnx-driver.rst

@@ -16,6 +16,11 @@ command line. Each back end manages one Data Mover of VNX. Multiple
 Shared File Systems service back ends need to be configured to manage
 multiple Data Movers.
 
+.. note::
+
+   Dell EMC VNX driver has been deprecated and will be removed in a future
+   release
+
 Requirements
 ~~~~~~~~~~~~
 

manila/share/drivers/dell_emc/driver.py

@@ -77,6 +77,9 @@ class EMCShareDriver(driver.ShareDriver):
         self.plugin_manager = manager.EMCPluginManager(
             namespace='manila.share.drivers.dell_emc.plugins')
         LOG.info("BACKEND IS: %s", self.backend_name)
+        if self.backend_name == 'vnx':
+            LOG.warning('Dell EMC VNX share driver has been deprecated and is '
+                        'expected to be removed in a future release.')
         self.plugin = self.plugin_manager.load_plugin(
             self.backend_name,
             configuration=self.configuration)

releasenotes/notes/deprecate-dellemc-vnx-20c9daec7aec541c.yaml

@@ -0,0 +1,5 @@
+---
+deprecations:
+  - |
+    The Dell EMC VNX share driver has been deprecated because the product has
+    reached its EOL. The driver will be removed in a future release.