Fix --wipeignore and add message indicating if wipe options are set and successful

Summary:
The --wipeignore option was impossible to use because the constructor
would write the input for that parameter to fWipeBan instead.

Adds fprintf() statements for the --wipeignore and --wipeban
options. This makes testings changes to these options easier and gives
the user some confimation that the options were used.

Test Plan:

make
./bitcoin-seeder --wipeban --wipeignore

Output should be as below:

Supporting whitelisted filters: 0x1,0x5,0x11,0x15
No nameserver set. Not starting DNS server.
Loading dnsseed.dat...Ban list wiped...Ignore list wiped...done
Starting seeder...done

Reviewers: deadalnix, Fabien, jasonbcox, O1 Bitcoin ABC, #bitcoin_abc

Reviewed By: jasonbcox, O1 Bitcoin ABC, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D4249