Update and clarify ssl_ciphers default

Peter Eisentraut <peter_e@gmx.net>

Commit: 32001ab0b7b4ee143e195f100543f531757a555b
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2014-02-25T01:30:28Z
Releases: 9.4.0
Update and clarify ssl_ciphers default

- Write HIGH:MEDIUM instead of DEFAULT:!LOW:!EXP for clarity.
- Order 3DES last to work around inappropriate OpenSSL default.
- Remove !MD5 and @STRENGTH, because they are irrelevant.
- Add clarifying documentation.

Effectively, the new default is almost the same as the old one, but it
is arguably easier to understand and modify.

Author: Marko Kreen <markokr@gmail.com>

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