Elaborate on the need to re-login on Debian-based systems to use tor following usermod
Elaborate on the need to re-login on Debian-based systems to use tor following usermod

Starting bitcoind with `-onlynet=onion` immediately after adding bitcoind user to debian-tor group will yield the following notice on debug.log:

"tor: Authentication cookie /run/tor/control.authcookie could not be opened (check permissions)"

Elaborate on the need to re-login to ensure debian-tor group has been applied to bitcoind user after:

	sudo usermod -a -G debian-tor username

Verification can be done via `groups` command in shell.

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