New executor checklist

This is a checklist for adding new test executor to Taurus.

There's another guide that focuses on the implementation of test executor.

Code

• Executor class
• ResultsReader class (for load executors)
• Test engine plugin to write test results in Taurus-compatible LDJSON (for functional)
• Update bzt/resources/base-config.yml
• Sidebar widget for console dashboard

Tests

• Unit tests
• Manual testing

Docs

• Add new executor doc page in site/dat/docs/
  • Short description
  • List of features
  • Configuration examples
  • Notes and specifics
• Mention new executor to index and to execution settings
• Add .change file to site/dat/docs/changes/

Miscellaneous

• Add to examples/all-executors.yml
• Update Dockerfile and verify that Docker build works
• Add usage example to examples/
• Update MANIFEST.in and ensure that python setup.py sdist includes all necessary files