test: speed up wallet_address_types by whitelisting peers (immediate tx relay)
test: speed up wallet_address_types by whitelisting peers (immediate tx relay)

approaches another part of #16613 ("Functional test suite bottlenecks")

As for wallet_backup.py (Commit 581c9be0d8bff46cd68bd6a3bf72f22d11c09aea), the
bottleneck is in relaying transactions. By whitelisting the peers, the
inventory is transmissioned immediately rather than on average every 5 seconds,
speeding up the test significantly:

before:
$ time ./wallet_address_types.py
real    1m30.072s
user    0m6.478s
sys     0m2.298s

with this PR:
$ time ./wallet_address_types.py
real    0m26.785s
user    0m5.525s
sys     0m1.888s

DigitalPandacoin/pandacoin,peercoin/peercoin,peercoin/peercoin,DigitalPandacoin/pandacoin,peercoin/peercoin,DigitalPandacoin/pandacoin,peercoin/peercoin,DigitalPandacoin/pandacoin,peercoin/peercoin,DigitalPandacoin/pandacoin,DigitalPandacoin/pandacoin,peercoin/peercoin