Merge branch 'buster' into 'master'

.gitlab-ci.yml

.rubocop.yml

addons/kascade/kascade

bin/kaconsole3

bin/kaenv3

bin/kanodes3

bin/kapower3

db/db_creation.sql

db/update-15.1.sql

debian/control

lib/kadeploy3/client/client.rb

lib/kadeploy3/common/compat.rb

lib/kadeploy3/common/configparser.rb

lib/kadeploy3/common/environment.rb

lib/kadeploy3/common/error.rb

lib/kadeploy3/common/execute.rb

lib/kadeploy3/common/fetchfile.rb

lib/kadeploy3/common/http.rb

lib/kadeploy3/common/httpd.rb

lib/kadeploy3/common/nodes.rb