Fix IT logging to honor the correct environment.

[sappenin]

Logging emissions like this one...

22:32:37.543 [main] INFO  org.xrpl.xrpl4j.tests.EscrowIT - EscrowCreate transaction successful: https://testnet.xrpl.org/transactions/989B07D8D7A8622E6D15F8BD7F2F9207347E256EF6B8A5BD2A57FB353B159F72

... should honor the environment that the test is running in. For example, when running in the DevNet, this URL should show devnet. Likewise, when running locally, these should display the URL of the rippled running in the local Docker container. In other words, we should source the domain for these from a helper function that inspects the currently running environment.

[sappenin]

Note that this functionality is already implemented via #606, but just needs to be updated and reviewed.