Racknerd Ubuntu 20 and macos SSH support

[sekisanchi]

Working Putty is not available on macos bigsur probably because of recently added security restriction. So others have to be supported. Since those were woking before try installing the latest idena-manager, I looked in to further.
I went through terminal and SSH on macos into racknerd ubuntu 20 VPS trying to duplicate done through putty.

For the ubuntu 20 image given, curl, cron and "column" are missing and former two can be got by apt or apt-get.
The "column" is not handy by the problem
https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1705437

So I removed it, then the log shows at least the node start running, but still can not connect rpc yet.
I'm going to look at further, but please consider adding some flexibility over the current configuration limitation.

[rioda-org]

Hi seki, I have forked idena-manager from crackowitch, original author, I wanted to make small changes, but never found time. When I find some time I will see about this problem with racknerd... but so many things to do...