unskip test_integration_1

Finally the test_integration_1 test became unskipable.
* ssh a machine on neutron is not as flaky as before.
* Attaching volume to a booted instance is not flaky.
* EC2 Image bundle is working again.

Change-Id: I88dd708f1091d7d4ee1d7e03d800f7165f4936a4
TODO: Add stricter response validation.

tempest/thirdparty/boto/test_ec2_instance_run.py

@@ -220,7 +220,6 @@ class InstanceRunTest(boto_test.BotoTestCase):
 
     # NOTE(afazekas): doctored test case,
     # with normal validation it would fail
-    @test.skip_because(bug="1182679")
     @test.attr(type='smoke')
     def test_integration_1(self):
         # EC2 1. integration test (not strict)