sslutil: be less strict about which ciphers are allowed when using --insecure
Python 3.10 restricted which ciphers are enabled by default, leading to
no available ciphers for TLS < 1.2. When using the --insecure flag we
allow old TLS, so also adjust the cipher list to give connections a
chance to work.
On the server side, also loosen the cipher selection in tests (when
using the devel.serverexactprotocol option).
Differential Revision: https://phab.mercurial-scm.org/D12489
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