3ee4be1 Make tests pass after 2020 (Bernhard M. Wiedemann)
Pull request description:
Make tests pass after 2020
and also test that 64 bit integers are properly handled
Without this patch, the failure was
```
unknown location(0): fatal error: in "rpc_tests/rpc_ban": std::runtime_error: JSON value is not an object as expected
test/rpc_tests.cpp(260): last checkpoint
```
I found this when testing reproducible builds for openSUSE Linux packages, building 15 years from now (this is the expected lifespan of today's software)
There is 1 other issue in ./src/qt/test/paymentservertests.cpp that fails to verify a cert that expires in 2022 after 10y.
```
QWARN : PaymentServerTests::paymentServerTests() PaymentRequestPlus::getMerchant: Payment request: certificate expired or not yet active: QSslCertificate("3", "01", "Ipbt+DxK8RDQd25/5ueXqw==", (), ("Payment Request Test Merchant"), QMap(), QDateTime(2012-12-10 16:37:24.000 UTC Qt::TimeSpec(UTC)), QDateTime(2022-12-08 16:37:24.000 UTC Qt::TimeSpec(UTC)))
FAIL! : PaymentServerTests::paymentServerTests() Compared values are not the same
```
Tree-SHA512: d6c49879b6abbddbecc1168ac24c2d4f4ee9949b615607b3e6ba350c415136017f32cd112708791b063a2f2dc1b12f295f4ee55a346bd2128aa6480088d8db48
Backport of Core PR13061