Share encryption2.mod (pbkdf2.mod) settings

[michaelortmann]

Found by: michaelortmann Patch by: michaelortmann Fixes: #1657

One-line summary: Share encryption2.mod (pbkdf2.mod) settings

Additional description (if needed):

Test cases demonstrating functionality (if applicable):

[...]
[17:58:21] Userlist transfer complete; switched over.
[17:58:21] PBKDF2: received new pbkdf2-method from share master: sha256 -> sha512. Consider setting it in your eggdrop config file.
[17:58:21] PBKDF2: received new pbkdf2-rounds from share master: 16000 -> 31337. Consider setting it in your eggdrop config file.
[...]