Python: Replace rest of from testlib import *

I think we should write our tests in a way that puts points-to in the
best condition to resolve calls. Although this specific change did not
change much, it should help set us up for success in the future 👍

python/ql/test/experimental/dataflow/variable-capture/dict.py

@@ -8,7 +8,7 @@ import sys
 import os
 
 sys.path.append(os.path.dirname(os.path.dirname((__file__))))
-from testlib import *
+from testlib import expects
 
 # These are defined so that we can evaluate the test code.
 NONSOURCE = "not a source"

python/ql/test/experimental/dataflow/variable-capture/in.py

@@ -7,7 +7,7 @@ import sys
 import os
 
 sys.path.append(os.path.dirname(os.path.dirname((__file__))))
-from testlib import *
+from testlib import expects
 
 # These are defined so that we can evaluate the test code.
 NONSOURCE = "not a source"
@@ -93,4 +93,3 @@ def inLocal():
 @expects(3)
 def test_inLocal():
     inLocal()
-

python/ql/test/experimental/dataflow/variable-capture/nonlocal.py

@@ -8,7 +8,7 @@ import sys
 import os
 
 sys.path.append(os.path.dirname(os.path.dirname((__file__))))
-from testlib import *
+from testlib import expects
 
 # These are defined so that we can evaluate the test code.
 NONSOURCE = "not a source"