Mark the StorPool driver as supported again.

The StorPool third-party CI system is up and running at
https://spfactory.storpool.com/

This reverts commit 07e6086ca23e4666e5ad90d58ca8c1af4b8f407d.

Change-Id: I9f41580c03f8a803cb32353d4f2ca207fa09b371

cinder/volume/drivers/storpool.py

@@ -96,9 +96,6 @@ class StorPoolDriver(driver.VolumeDriver):
     VERSION = '1.2.3'
     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

@@ -256,7 +256,7 @@ driver.quobyte=complete
 driver.rbd=complete
 driver.seagate=complete
 driver.sheepdog=missing
-driver.storpool=missing
+driver.storpool=complete
 driver.synology=complete
 driver.vrtsaccess=missing
 driver.vrtscnfs=complete

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

@@ -1,14 +0,0 @@
----
-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.