Debian Buster has easyrsa 3. Since we're nearing Bullseye now, it is
safe to asssume that most users are already using easyrsa 3.
The code to do the upgrade is 2 years old already. Removing it.
Signed-off-by: Joseph Nuthalapati <njoseph@riseup.net>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>