Switch to using minio's mc client.

[presztak]

Fixes: #450

[presztak]

@stgraber, I'm not sure about runClientCommand method. Very similar implementation we have in subprocess package but I've needed to modify this a little bit to support change of working directory. mc admin cluster iam export creates file in current working directory so I think it would be better to have possibility to change CWD for any new file.

[stgraber]

Very good feedback from @gibmat, I'll let you sort those out!

I'm on vacation this week so I don't get to review things quite as quickly than usual but still usually get to process a couple PRs a day. I may get back to that one this evening or otherwise tomorrow morning.

Thanks!

[stgraber]

stgraber@castiana:~/data/code/lxc/incus (735)$ ~/minio-binaries/mc --version
mc version RELEASE.2024-04-18T16-45-29Z (commit-id=3ec030eb26e460ec62655487ba116a05eda3ac99)
Runtime: go1.21.9 linux/amd64
Copyright (c) 2015-2024 MinIO, Inc.
License GNU AGPLv3 <https://www.gnu.org/licenses/agpl-3.0.html>

stgraber@castiana:~/data/code/lxc/incus (735)$ mc --version
GNU Midnight Commander 4.8.29
Built with GLib 2.74.5
Built with S-Lang 2.3.3 with terminfo database
Built with libssh2 1.10.0
With builtin Editor and Aspell support
With subshell support as default
With support for background operations
With mouse support on xterm and Linux console
With support for X11 events
With internationalization support
With multiple codepages support
With ext2fs attributes support
Virtual File Systems:
 cpiofs, tarfs, sfs, extfs, ext2undelfs, ftpfs, sftpfs, fish
Data types:
 char: 8; int: 32; long: 64; void *: 64; size_t: 64; off_t: 64;
stgraber@castiana:~/data/code/lxc/incus (735)$ 

So probably look at the first line of output, if you get mc version that seems like it's going to be MinIO, if you get anything else, let's assume it's not.

[stgraber]

LGTM, thanks!