iop: ssh_install_key: Disable host key checking

This change simplifies ssh key install
when connecting to different hosts with same IP address.

iop/scripts/install_key.sh

@@ -48,7 +48,10 @@ function ssh_install_key {
     local keys="$(get_ssh_public_keys)"
     echo "Adding the following keys to $DROPBEAR_AUTHORIZED_KEYS_FILE on $host:"
     echo "$keys"
-    ssh root@$host "echo '$keys' >> '$DROPBEAR_AUTHORIZED_KEYS_FILE'" && echo ok
+    ssh \
+        -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null \
+        root@$host \
+        "echo '$keys' >> '$DROPBEAR_AUTHORIZED_KEYS_FILE'" && echo ok
 }
 
 register_command "ssh_install_key" "Install the users public ssh key on host running dropbear"