Declare multiattach support for HPE MSA

Change-Id: Ie12c2a88f684a37be76d9b16d58431f19a39b1b6
(cherry picked from commit efc90273f8)

cinder/tests/unit/volume/drivers/test_dothill.py

@@ -406,6 +406,7 @@ class TestFCDotHillCommon(test.TestCase):
                                      'total_capacity_gb': 100}],
                           'storage_protocol': None,
                           'vendor_name': 'DotHill',
+                          'multiattach': True,
                           'volume_backend_name': None}, self.common.stats)
 
     @mock.patch.object(dothill.DotHillClient, 'create_volume')
@@ -711,6 +712,7 @@ class TestDotHillFC(test.TestCase):
                  'driver_version': self.driver.VERSION,
                  'volume_backend_name': None,
                  'vendor_name': self.vendor_name,
+                 'multiattach': True,
                  'pools': [{'free_capacity_gb': 90,
                             'reserved_percentage': 0,
                             'total_capacity_gb': 100,

cinder/volume/drivers/dothill/dothill_common.py

@@ -263,6 +263,7 @@ class DotHillCommon(object):
                  'storage_protocol': None,
                  'vendor_name': self.vendor_name,
                  'volume_backend_name': None,
+                 'multiattach': True,
                  'pools': []}
 
         pool = {'QoS_support': False}

cinder/volume/drivers/dothill/releasenotes/notes/msa-multiattach-5407eb60093de8f1.yaml

@@ -0,0 +1,3 @@
+---
+features:
+  - Support for multiattach is enabled for HPE MSA Storage