* get coverage for console functional test
* instrument kibana
* collect coverage stats after each test, on url navigation, refresh and back
* switch to babel-plugin-istanbul
* switch to babel-plugin-istanbul
* [coverage service] basic version
* trigger final coverage flush when ftr finishes, wait for all logs before exiting
* add coverage report generation
* increase optimizer timeout, re-run idx/babel plugin before istanbul
* increase memory usage for node
* put istanbul preset in the beginning to run as the last one
* bump babel-plugin-istanbul up to 5.2.0
* cleanup
* save unique json files with coverage
* [functional test coverage] update coverage.json path
* run code coverage on CI
* increase max-old-space-size with env variable
* fix coverage folder creation
* use env variable to configure code coverage
* revert ci config changes
* remove duplicate plugin
* remove comments
* fixes
