Revert "skip test_volume_boot_pattern"

This reverts commit cb6c99f31174f0cc3b2c20c9eeef721b0cabb790.

Bug 1270608 is fixed by Cinder change Ib615847f now so enable
test_volume_boot_pattern.

Related-Bug: #1270608

Change-Id: Ic67995d64bead7f318a9c054f9dd6b25ca10bd4e
diff --git a/tempest/scenario/test_volume_boot_pattern.py b/tempest/scenario/test_volume_boot_pattern.py
index c4f8ced..e3070fc 100644
--- a/tempest/scenario/test_volume_boot_pattern.py
+++ b/tempest/scenario/test_volume_boot_pattern.py
@@ -13,7 +13,6 @@
 from tempest.common.utils import data_utils
 from tempest.openstack.common import log
 from tempest.scenario import manager
-import tempest.test
 from tempest.test import services
 
 
@@ -126,7 +125,6 @@
         actual = self._get_content(ssh_client)
         self.assertEqual(expected, actual)
 
-    @tempest.test.skip_because(bug="1270608")
     @services('compute', 'volume', 'image')
     def test_volume_boot_pattern(self):
         keypair = self.create_keypair()