Add grep to improve nftables compatibility #102
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Fail2ban uses
grep -Pfor some nftables commands, see https://github.com/fail2ban/fail2ban/blob/master/config/action.d/nftables.conf#L56.Busybox' grep doesn't have the -P option, so adding GNU grep should solve the issue.
Resolves #101.