datatype: reject rate in quota statement

datatype: reject rate in quota statement

Bail out if rate are used:

 ruleset.nft:5:77-106: Error: Wrong rate format, expecting bytes or kbytes or mbytes
 add rule netdev firewall PROTECTED_IPS update @quota_temp_before { ip daddr quota over 45000 mbytes/second } add @quota_trigger { ip daddr }
                                                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

improve error reporting while at this.

Fixes: 6615676d825e ("src: add per-bytes limit")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>