FIX: Removed obsolete nose import.

tests/test_issues_mysqlbackend.py

@@ -25,8 +25,6 @@
 
 import caosdb as db
 
-from nose.tools import with_setup
-
 
 def setup_module():
     try:
@@ -70,7 +68,6 @@ def test_issue_18():
     assert len(set(pids)) == len(pids), "Duplicate parents."
 
 
-@with_setup(setup, teardown)
 def test_issue_21():
     """Removing the last child in an inheritance chain of 4 failed with versioning.