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Merge bound branch test performance improvements.

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bzrlib/transport/sftp.py
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# X seconds. But that requires a lot more fanciness.
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_connected_hosts = weakref.WeakValueDictionary()
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def clear_connection_cache():
 
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    """Remove all hosts from the SFTP connection cache.
 
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    Primarily useful for test cases wanting to force garbage collection.
 
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    """
 
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    _connected_hosts.clear()
 
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def load_host_keys():
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    """