Add dropwizard and jackson to tests build gradle.
Add dropwizard and jackson to tests build gradle.

palantir/atlasdb,palantir/atlasdb,andy2palantir/atlasdb,EvilMcJerkface/atlasdb,sh4nth/atlasdb-1,andy2palantir/atlasdb,EvilMcJerkface/atlasdb,EvilMcJerkface/atlasdb,j-baker/atlasdb,sh4nth/atlasdb-1,palantir/atlasdb,j-baker/atlasdb,j-baker/atlasdb