Update old OpenSSH default DH key size

For Windows 2000, setupssh371-20031015.exe sholud be a good choice for SSH Server / Client. But when connecting to Jenkins as a SSH Publisher, Jenkins complained that DH key size 2047 not valid. How to fix it? Generate by yourself:

• cd "C:\Program Files\OpenSSH\bin"
• ssh-keygen -G moduli-2048.candidates -b 2048
• (wait)
• ssh-keygen -T moduli-2048 -f moduli-2048.candidates
• (wait)
• move moduli-2048 ..\etc\moduli
• del moduli-2048.candidate