chg: dev: fix the rsa exponent to 65537
There isn't a realistic reason to ever use e = 4294967297. Fortunately its codepath wasn't reachable to users and can be safetly removed.
Keep in mind the dns_key_generate
header comment was outdated. e = 3
hasn't been used since 2006 so there isn't a reason to panic. The
toggle was the public exponents between 65537 and 4294967297.
Edited by Aydın Mercan