Fixed compilation errors in build-info-client integration tests; added tests

I noticed that integration tests in `build-info-client` are not getting compiled and run, as part of the usual build. I need to run those tests, since I would like to change the `ArtifactoryBuildInfoClient.deployArtifact(DeployDetails)` to return the metadata sent in the Artifactory REST response.

This is related to https://github.com/JFrogDev/build-info/issues/31