Mark Storpool Driver Unsupported

The Storpool Driver 3rd Party CI hasn't
reported in over 60 days.  This does not meet the requirements
for Cinder's 3rd Party CI requirements.

As a result the driver is being marked unsupported in the
Train release and should be removed in the 'U' release if
the problems are not resolved.

Change-Id: Ia385485d41617e1be5c6b60705ee39e39832a945

cinder/volume/drivers/storpool.py

@@ -96,6 +96,9 @@ class StorPoolDriver(driver.VolumeDriver):
     VERSION = '1.2.1'
     CI_WIKI_NAME = 'StorPool_CI'
 
+    # TODO(jsbryant) Remove driver in the 'U' release if CI is not fixed.
+    SUPPORTED = False
+
     def __init__(self, *args, **kwargs):
         super(StorPoolDriver, self).__init__(*args, **kwargs)
         self.configuration.append_config_values(storpool_opts)

doc/source/reference/support-matrix.ini

@@ -252,7 +252,7 @@ driver.qnap=complete
 driver.quobyte=complete
 driver.rbd=complete
 driver.sheepdog=missing
-driver.storpool=complete
+driver.storpool=missing
 driver.synology=complete
 driver.vrtsaccess=complete
 driver.vrtscnfs=complete

releasenotes/notes/storpool-unsupported-11b221fed109535f.yaml

@@ -0,0 +1,14 @@
+---
+upgrade:
+  - |
+    The Storpool 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 Storpool 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.