Add settings to control SSL/TLS protocol version
For example:
ssl_min_protocol_version = 'TLSv1.1'
ssl_max_protocol_version = 'TLSv1.2'
Reviewed-by: Steve Singer <steve@ssinger.info>
Discussion: https://www.postgresql.org/message-id/flat/
1822da87-b862-041a-9fc2-
d0310c3da173@2ndquadrant.com