pgpool: Update SSL hard coded DH parameters.

Update SSL hard coded DH parameters.

When ssl_dh_params_file is empty or is set to wrong one, a built-in
hard coded DH parameters is used. The current parameter was imported
from PostgreSQL. However, PostgreSQL updated it in 2019 in commit
8a810a177c80909b71e9fb3760a1d56ed988638a. This commit imports the
version.

While I'm at it, update the copyright year and adds PostgreSQL and the
University of California copyright as we imported it from PostgreSQL.

Since this is not a bug fix, pushed to only master branch.

Author: Tatsuo Ishii <ishii(at)postgresql(dot)org>

Branch
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master

Details
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https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=bf7e2d86c6cb4bf462b8d1ffd1e101468e2ada18

Modified Files
--------------
src/include/utils/pool_ssl.h | 25 ++++++++++++++-----------
1 file changed, 14 insertions(+), 11 deletions(-)