Improvements to wg-quick output for linux.bash.

[pete4abw]

Replaced use of <(echo $var)' for wg setconf -fandnft -fcommands. Use of<(echo $var)' obscured actual input to wg and nft commands and replaced with /dev/fd/63 which just indicates piped input. After this commit, output will reflect actual commands for nft and will echo the config parameters being read by wg setconf. Config parameters will also hide Private and Preshared keys like the `wg' command.

Before

[#] wg setconf wg0 /dev/fd/63 [#] nft -f /dev/fd/63

After

[#] wg setconf wg0 /dev/fd/63 wg configuration [Interface] PrivateKey = (hidden) ListenPort = 51820

[Peer] PublicKey = xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx= PresharedKey = (hidden) AllowedIPs = 0.0.0.0/0 Endpoint = xxx.xxx.xxx.xxx:51820 PersistentKeepalive = 25

[#] nft delete table ip wg-quick-wg0