Mark storwize driver supported

Storwize cinder driver has been marked as unsupported due to lack
of external CI running log. Now IBM new external CI system is up
and running. We plan to mark storwize cinder driver as supported
again. This commit updated Storwize driver, release notes and
support-matrix.ini.

Change-Id: I6c87d75e61796943e570f8f98803e9135ce7d6ee
(cherry picked from commit e012113ca1)

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

@@ -2648,9 +2648,6 @@ 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=missing
 driver.ibm_gpfs=complete
-driver.ibm_storwize=missing
+driver.ibm_storwize=complete
 driver.ibm_xiv=complete
 driver.infortrend=complete
 driver.inspur=complete

releasenotes/notes/ibm-storwize-supported-6518628fb78d58a4.yaml

@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    IBM Storwize drivers had been previously marked unsupported. Testing
+    requirements have been addressed and they are now fully supported again.
+    IBM Storwize drivers allow cinder to manage volumes both in iSCSI and
+    FC environment.