Skip test_timer in travis

The test-timer test is not deterministic. It may fail occasionally
(e.g. if the machine is overloaded) cause testsuite failures that
interfere with CI.

Exclude this test in travis.

Author: cmft

.travis.yml

@@ -16,4 +16,4 @@ before_install:
 
 script:
   - docker exec taurus-test /bin/bash -c "cd taurus ; python setup.py install"
-  - docker exec taurus-test /bin/bash -c "taurustestsuite"
+  - docker exec taurus-test /bin/bash -c "taurustestsuite -e taurus\.core\.util\.test\.test_timer"