misc improvements to cli (#2827)

* misc improvements to cli

* switch host shorthand to H

* simplify macro

core/startos/src/db/model/private.rs

@@ -32,5 +32,7 @@ pub struct Private {
 }
 
 pub fn generate_compat_key() -> Pem<ed25519_dalek::SigningKey> {
-    Pem(ed25519_dalek::SigningKey::generate(&mut rand::thread_rng()))
+    Pem(ed25519_dalek::SigningKey::generate(
+        &mut ssh_key::rand_core::OsRng::default(),
+    ))
 }