[environments] Add execution environment related command

Currently implements listing of remote and local docker
environments.
4 jobs for implement_execution_environment_handling in 5 minutes and 47 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #176347
docker-build
build_linux_36

00:05:38

54.0%
passed #176348
docker-build
build_linux_37

00:05:34

54.0%
passed #176345
macosx
build_macosx_36

00:04:57

54.0%
passed #176346
macosx
build_macosx_37

00:04:47

54.0%