Stress improts

* Partial relative import fix
* Wildcard imports removed
* stress/utils/util.py renamed to stress/utils.py
* time/datetime module aliasing removed

Change-Id: Ib0b234581695604c10c51915210e4643a8732874
diff --git a/stress/tests/floating_ips.py b/stress/tests/floating_ips.py
index 6a4452c..b1b3778 100755
--- a/stress/tests/floating_ips.py
+++ b/stress/tests/floating_ips.py
@@ -13,8 +13,10 @@
 #    limitations under the License.
 """Stress test that associates/disasssociates floating ips."""
 
+import datetime
+
 from stress.basher import BasherAction
-from stress.driver import *
+from stress.driver import bash_openstack
 from stress.test_floating_ips import TestChangeFloatingIp
 from tempest import clients