differentiate between prefix rejected from static prefix list vs IRR

[forkwhilefork]

We have separate communities defined for a prefix that is rejected due to not being in a static prefix list vs not being in an IRR-generated prefix list. We are not currently using the latter. We need to add a variable to the customer-filtering function and to the peer-filtering function that specifies the filter type (static or IRR), then make sure we pass that variable correctly when we generate the per-customer filter.

[forkwhilefork]

This is related to #2.