David Garske b7c08988dc Fix for verify callback override of intermediate CA provided by peer not being added to trusted CA list.
Feature: Added support for testing date override at build-time using `TEST_BEFORE_DATE`.

```
./examples/server/server -H overrideDateErr -A ./certs/ca-cert.pem -k ./certs/server-key.pem -c ./certs/intermediate/server-chain.pem &
./examples/client/client -D -A ./certs/ca-cert.pem -k ./certs/client-key.pem -c ./certs/intermediate/client-chain.pem
```
2019-09-16 14:47:55 -07:00
..
2019-03-15 10:37:36 -07:00