Revert "Skip tests for transfering volumes when volumes are encrypted by LUKS"

This reverts commit 01baaf5d88f1ace9ff6d2293e557f2710bf45745.

Reason for revert: attach_encrypted_volume is always True so test will be skipped for all deployments (but we don't want that)

Change-Id: I735ff39522bf7d0adfa7fa7797d81712134840e9
diff --git a/tempest/api/volume/test_volume_transfers.py b/tempest/api/volume/test_volume_transfers.py
index f19bd98..62cb203 100644
--- a/tempest/api/volume/test_volume_transfers.py
+++ b/tempest/api/volume/test_volume_transfers.py
@@ -15,12 +15,9 @@
 
 from tempest.api.volume import base
 from tempest.common import waiters
-from tempest import config
 from tempest.lib.common.utils import test_utils
 from tempest.lib import decorators
 
-CONF = config.CONF
-
 
 class VolumesTransfersTest(base.BaseVolumeTest):
     """Test volume transfer"""
@@ -36,13 +33,6 @@
         cls.alt_volumes_client = cls.os_alt.volumes_client_latest
         cls.adm_volumes_client = cls.os_admin.volumes_client_latest
 
-    @classmethod
-    def skip_checks(cls):
-        super(VolumesTransfersTest, cls).skip_checks()
-        if CONF.compute_feature_enabled.attach_encrypted_volume:
-            raise cls.skipException('Transferring LUKS encrypted volume is '
-                                    'not supported')
-
     @decorators.idempotent_id('4d75b645-a478-48b1-97c8-503f64242f1a')
     def test_create_get_list_accept_volume_transfer(self):
         """Test creating, getting, listing and accepting of volume transfer"""