[WFCORE-26] Created a launcher API to use in tooling or plugins. The API generates the needed list of commands to launch a WildFly process.
[WFCORE-26] Convert the standalone test server to use the launcher API.
[WFCORE-26] Convert domain test runners to use the launcher API.
Merge pull request #28 from jamezp/WFLY-2427

[WFCORE-26] Add launcher API