Tests: Fix type error in volume encryption unit tests

Use booleans instead of strings.

Now that more unit test code runs, a few other errors
were detected and fixed:
 - Missing --force-password arg
 - Modifying "encryption" dict's provider field was
   updating the dict also stored in the mock, causing
   mismatches in unit tests.  Don't modify this dict,
   just use/manipulate the provider arg that we need.

Change-Id: I50f426a77f389f13278a21ad7193c8bbdbd8fd7a

cinder/tests/unit/volume/test_volume.py

@@ -1722,15 +1722,15 @@ class VolumeTestCase(base.BaseVolumeTestCase):
     @ddt.data({'connector_class':
                os_brick.initiator.connectors.iscsi.ISCSIConnector,
                'rekey_supported': True,
-               'already_encrypted': 'yes'},
+               'already_encrypted': True},
               {'connector_class':
                os_brick.initiator.connectors.iscsi.ISCSIConnector,
                'rekey_supported': True,
-               'already_encrypted': 'no'},
+               'already_encrypted': False},
               {'connector_class':
                os_brick.initiator.connectors.rbd.RBDConnector,
                'rekey_supported': False,
-               'already_encrypted': 'no'})
+               'already_encrypted': False})
     @ddt.unpack
     @mock.patch('cinder.volume.volume_utils.delete_encryption_key')
     @mock.patch('cinder.volume.flows.manager.create_volume.'
@@ -1748,9 +1748,11 @@ class VolumeTestCase(base.BaseVolumeTestCase):
             already_encrypted=None):
         # create source volume
         mock_execute.return_value = ('', '')
-        mock_enc_metadata_get.return_value = {'cipher': 'aes-xts-plain64',
+        mock_enc_metadata_get.return_value = {
-                                              'key_size': 256,
+            'cipher': 'aes-xts-plain64',
-                                              'provider': 'luks'}
+            'key_size': 256,
+            'provider': 'luks',
+            'encryption_key_id': fake.ENCRYPTION_KEY_ID}
         mock_setup_enc_keys.return_value = (
             'qwert',
             'asdfg',
@@ -1802,7 +1804,8 @@ class VolumeTestCase(base.BaseVolumeTestCase):
                 src_vol,
                 {'key_size': 256,
                  'provider': 'luks',
-                 'cipher': 'aes-xts-plain64'}
+                 'cipher': 'aes-xts-plain64',
+                 'encryption_key_id': fake.ENCRYPTION_KEY_ID}
             )
             if already_encrypted:
                 mock_execute.assert_called_once_with(
@@ -1816,6 +1819,7 @@ class VolumeTestCase(base.BaseVolumeTestCase):
             else:
                 mock_execute.assert_called_once_with(
                     'cryptsetup', '--batch-mode', 'luksFormat',
+                    '--force-password',
                     '--type', 'luks1',
                     '--cipher', 'aes-xts-plain64', '--key-size', '256',
                     '--key-file=-', '/some/device/thing',

cinder/volume/flows/manager/create_volume.py

@@ -596,17 +596,18 @@ class CreateVolumeFromSpecTask(flow_utils.CinderTask):
                     # and is detected as another format.
                     raise exception.Invalid()
 
-                if encryption['provider'] == 'luks':
+                encryption_provider = encryption['provider']
+                if encryption_provider == 'luks':
                     # Force ambiguous "luks" provider to luks1 for
                     # compatibility with new versions of cryptsetup.
-                    encryption['provider'] = 'luks1'
+                    encryption_provider = 'luks1'
 
                 (out, err) = utils.execute(
                     'cryptsetup',
                     '--batch-mode',
                     'luksFormat',
                     '--force-password',
-                    '--type', encryption['provider'],
+                    '--type', encryption_provider,
                     '--cipher', encryption['cipher'],
                     '--key-size', str(encryption['key_size']),
                     '--key-file=-',