Remove hyphen from rand_name calls in thirdparty tests

data_utils.rand_name() appends randam charactors with a hypen like:

 def rand_name(name=''):
     randbits = str(random.randint(1, 0x7fffffff))
     if name:
         return name + '-' + randbits

So it is not necessary to specify a hypen in caller side.
This patch removes a hypen in thirdparty tests.

Change-Id: I825b576b53e2b1209086cb68b3e27098f13f90d4
diff --git a/tempest/thirdparty/boto/test_s3_objects.py b/tempest/thirdparty/boto/test_s3_objects.py
index dee6a7c..dba231c 100644
--- a/tempest/thirdparty/boto/test_s3_objects.py
+++ b/tempest/thirdparty/boto/test_s3_objects.py
@@ -32,8 +32,8 @@
     @test.idempotent_id('4eea567a-b46a-405b-a475-6097e1faebde')
     def test_create_get_delete_object(self):
         # S3 Create, get and delete object
-        bucket_name = data_utils.rand_name("s3bucket-")
-        object_name = data_utils.rand_name("s3object-")
+        bucket_name = data_utils.rand_name("s3bucket")
+        object_name = data_utils.rand_name("s3object")
         content = 'x' * 42
         bucket = self.client.create_bucket(bucket_name)
         self.addResourceCleanUp(self.destroy_bucket,