This PR include three key changes:
1. Run tasks as soon as they have been marked as running, rather than wait for the whole batch to me marked
2. Use a custom refresh setting of refresh: false where possible, in place of wait_for, in order to speed up Task Manager's internal workflow
3. Instrumentation of Task Manager exposing Activity / Inactivity metrics in Performance test runs
Restructure testing with kbn-test package
- Run with multiple configs, move cli options to config
- Package-ify kbn-test
- Eventually we'll have functional_test_runner live in a package
of its own, and then this kbn-test will use that as a dependency,
probably still as a devDependency.
- Implement functional_tests_server
- Collapse single and multiple config apis into one command
Use kbn-es
Replace es_test_cluster + es_test_config with kbn/test utils
Implement new createEsTestCluster
Improve scripts, jsdocs, cli top-level tools
Lift error handling to the top level
