clan-cli: Fixup clan install which depends on ssh_parseargs.

clan-cli: Remove --ssh-option for now, as it can't work in current state

clan-cli: Remove nix_config from test as its impure

pkgs/clan-cli/clan_lib/ssh/remote.py

@@ -454,7 +454,7 @@ class Remote:
 @dataclass(frozen=True)
 class ConnectionOptions:
     timeout: int = 2
-    retries: int = 10
+    retries: int = 5
 
 
 @dataclass
@@ -527,6 +527,10 @@ def check_machine_ssh_reachable(
     if opts is None:
         opts = ConnectionOptions()
 
+    cmdlog.debug(
+        f"Checking SSH reachability for {remote.target} on port {remote.port or 22}",
+    )
+
     address_family = socket.AF_INET6 if ":" in remote.address else socket.AF_INET
     for _ in range(opts.retries):
         with socket.socket(address_family, socket.SOCK_STREAM) as sock: