rig.SSH.Upload requires sudo binary even if the remote user is root

[mikhail-sakhnov]

Consider following snippet of code

			SSH: &rig.SSH{
				User:    "root",
				Port:    22,
				Address: anyaddress,
			},
		}

        if err := h.Upload(localPath, remotePath); err != nil {
				return err
		}

If the remote system doesn't have sudo binary installed, than the output would be

DEBUG [ssh] 127.0.0.1:57019: executing `sudo install -D /tmp/tmp.ZY3Zwx8Pyt /remote/file/path`

while we can still use install command, because the connection user is "root"

[kke]

Yep, this is a problem especially with alpine. There's the unfinished #29 PR that should fix this.