test: mempool entry time is persisted
test: mempool entry time is persisted

Also, remove the now unused "Mine a single block to get out of IBD".
This was fixed in commit 1111aecbb5.

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