Remove skip decorator for volume scenario test

I think that this skip is not actual now. Main issue of this skip
was fixed in another bug.

Removing this skip decrator allow to check additional scenario
of server's booting.

Change-Id: I1fadc46a022e698eb96b88594325e4d9b86fe901
Closes-Bug: #1489581
diff --git a/tempest/scenario/test_volume_boot_pattern.py b/tempest/scenario/test_volume_boot_pattern.py
index d4bddc0..678fcfc 100644
--- a/tempest/scenario/test_volume_boot_pattern.py
+++ b/tempest/scenario/test_volume_boot_pattern.py
@@ -11,7 +11,6 @@
 #    under the License.
 
 from oslo_log import log
-from tempest_lib import decorators
 
 from tempest.common.utils import data_utils
 from tempest.common import waiters
@@ -164,7 +163,6 @@
         ssh_client = self._ssh_to_server(instance_from_snapshot, keypair)
         self._check_content_of_written_file(ssh_client, text)
 
-    @decorators.skip_because(bug='1489581')
     @test.idempotent_id('36c34c67-7b54-4b59-b188-02a2f458a63b')
     @test.services('compute', 'volume', 'image')
     def test_create_ebs_image_and_check_boot(self):