Fix overquota output result

Current implementation shows "packet" for none byte quota type.
It means "packet" was used for overquota counter as well and it
wasn't so informative.

This commmit adds additional column - overquota with yes/no value.

Signed-off-by: Alexey Perevalov <a.perevalov@samsung.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>