Mark the IBM Storwize driver unsupported

The IBM driver CIs stopped reporting some time
ago and attempts to reach out to driver maintainers
have failed.

As a result, we need to mark the drivers unsupported
for the T release.

Change-Id: I0a65e4b72e3739dac576924dec11cd8eab3fcccc

cinder/volume/drivers/ibm/storwize_svc/storwize_svc_common.py

@@ -2647,6 +2647,9 @@ class StorwizeSVCCommonDriver(san.SanDriver,
     VDISKCOPYOPS_INTERVAL = 600
     DEFAULT_GR_SLEEP = random.randint(20, 500) / 100.0
 
+    # TODO(jsbryant) Remove driver in the 'U' release if CI is not fixed.
+    SUPPORTED = False
+
     def __init__(self, *args, **kwargs):
         super(StorwizeSVCCommonDriver, self).__init__(*args, **kwargs)
         self.configuration.append_config_values(storwize_svc_opts)

doc/source/reference/support-matrix.ini

@@ -232,7 +232,7 @@ driver.infinidat=complete
 driver.ibm_ds8k=complete
 driver.ibm_flashsystem=complete
 driver.ibm_gpfs=complete
-driver.ibm_storwize=complete
+driver.ibm_storwize=missing
 driver.ibm_xiv=complete
 driver.infortrend=complete
 driver.inspur=complete

releasenotes/notes/ibm-storwize-unsupported-e79cfd27523f013c.yaml

@@ -0,0 +1,14 @@
+---
+upgrade:
+  - |
+    The IBM Storwize drivers have been marked as unsupported
+    and are now deprecated. ``enable_unsupported_driver`` will need
+    to be set to ``True`` in the driver's section in cinder.conf to
+    continue to use them.
+deprecations:
+  - |
+    The IBM Storwize drivers have been marked as unsupported
+    and are now deprecated. ``enable_unsupported_driver`` will need
+    to be set to ``True`` in the driver's section in cinder.conf to
+    continue to use them. If the support status does not change, they
+    will be removed in the 'U' development cycle.