Revert "Declare multiattach support for HPE MSA"

This reverts commit fc658f492f.

While reviewing this patch it was discovered that the
multi-attach tempest test cases were not being run against the
driver.  A bug was found when the tests were enabled.  So, this
patch should be reverted as the mult-attach support isn't really
working.

There was discussion that this should be reverted because it was
a feature but the team determined it was really a bug fix.  If the
bug fix is able to be backported the flag can be re-enabled.

Change-Id: I089e2728c4253756db7e38e43f505867d23b7d3e

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

@@ -406,7 +406,6 @@ 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')
@@ -712,7 +711,6 @@ 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

@@ -263,7 +263,6 @@ 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

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