Wei Zhou 10f72a17f6
server: use ecdsa instead of ed25519 when generate public/private keys (#8719)
PR #8549 replaced RSA with ed25519. unfornately, ed25519 is unsupported in FIPS mode

```
$  ssh-keygen -t ed25519 -m PEM -N '' -f key1
ED25519 keys are not allowed in FIPS mode

$  ssh-keygen -t ecdsa -m PEM -N '' -f key1
Generating public/private ecdsa key pair.
Your identification has been saved in key1
Your public key has been saved in key1.pub
The key fingerprint is:
.........

```
2024-03-03 15:56:13 +01:00
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