Mark IBM GPFS 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: I7ee68f4684b241b8ab749ad621040da4e3068d17

cinder/volume/drivers/ibm/gpfs.py

@@ -166,6 +166,9 @@ class GPFSDriver(driver.CloneableImageVD,
     # ThirdPartySystems wiki page
     CI_WIKI_NAME = "IBM_GPFS_CI"
 
+    # TODO(jsbryant) Remove driver in the 'U' release if CI is not fixed.
+    SUPPORTED = False
+
     def __init__(self, *args, **kwargs):
         super(GPFSDriver, self).__init__(*args, **kwargs)
         self.configuration.append_config_values(gpfs_opts)

doc/source/reference/support-matrix.ini

@@ -297,7 +297,7 @@ driver.huawei_fusionstorage=complete
 driver.infinidat=complete
 driver.ibm_ds8k=complete
 driver.ibm_flashsystem=complete
-driver.ibm_gpfs=complete
+driver.ibm_gpfs=missing
 driver.ibm_storwize=complete
 driver.ibm_xiv=complete
 driver.infortrend=complete

releasenotes/notes/ibm-gpfs-unsupported-b95274829573835d.yaml

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