[pybsddb] `module 'test.support' has no attribute 'find_unused_port'` with python3.9

[Michał Górny]

Hello,

When running bsddb3 tests on py3.9, I get the following error:

======================================================================
ERROR: test01_basic_replication (bsddb3.tests.test_replication.DBReplicationManager)
----------------------------------------------------------------------   
Traceback (most recent call last):                                       
  File "/usr/lib/python3.9/unittest/case.py", line 59, in testPartExecutor                                                                         
    yield                                                                                                                                          
  File "/usr/lib/python3.9/unittest/case.py", line 593, in run                                                                                     
    self._callTestMethod(testMethod)                                                                                                               
  File "/usr/lib/python3.9/unittest/case.py", line 550, in _callTestMethod                                              
    method()
  File "/tmp/portage/dev-python/bsddb3-6.2.7/work/bsddb3-6.2.7-python3_9/build/lib/bsddb3/tests/test_replication.py", line 108, in test01_basic_rep
lication
    master_port = test_support.find_unused_port()
AttributeError: module 'test.support' has no attribute 'find_unused_port' 

----------------------------------------------------------------------

FWICS upstream moved the relevant function to test.support.socket_helper
in 16994912c93e8e5db7365d48b75d67d3f70dd7b2.


-- 
Best regards,
Michał Górny

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