[3.7] bpo-36629: Add support.get_socket_conn_refused_errs() (GH-12834) #12835
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Fix test_imap4_host_default_value() of test_imaplib: catch also
errno.ENETUNREACH error.
(cherry picked from commit 3c7931e)
Co-authored-by: Victor Stinner [email protected]
https://bugs.python.org/issue36629