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
* [uiExports] migrate uiApp "uses" to explicit imports in apps
* [uiApp] update tests for getModules() method
* [optimize/uiExports] improve naming and comments
* [uiExports] sort imports so they load in the same order as before
* [testHarness] load hacks when testing in the browser
* [x-pack/uiExports] use new uiExports modules
* [testHarness] describe why we import uiExports/hacks
* [optimize] remove needless [].concat()
* [optimize/createUiExportsModule] string.includes > string.indexOf
* [uiExports/createUiExportsModule] remove needless capture of module exports
* [kbn-plugin-generator] add plugin generator to the repo
* [plugin-generator] use snake_case plugin name for directory name
* [plugin-generator] fix typo
* [plugin-generator] remove translation support until we resume i18n efforts
* [yarn] update lockfile
* [mocha] remove plugin-generator selector from mocha tests
* [plugin-generator] update generated readme to recommend yarn
* [plugin-generator] add readme to generator pacakge
* [plugin-generator] link from plugin-resource docs
* [plugin-generator] mention very important `kbn bootstrap` script
* [plugin-generator] rework some parts of the README
* [plugin-generator] log actual directory name with system separators
* [plugin-generator] include bootstrap/yarn preinstall check script
