Enforce .editorconfig by running eclint (#213)

* tune .editorconfig for the existing files
* fix reported linting issues
* travis: switch language to node_js to be able to run npm
* travis: build on ubuntu bionic

.travis.yml

@@ -1,5 +1,10 @@
 sudo: required
-language: bash
+dist: bionic
+language: node_js
+
+node_js:
+  - stable
+
 env:
   global:
     - HADOLINT_VERSION=1.16.3
@@ -20,6 +25,7 @@ before_install:
   - sudo chmod +rx /usr/local/bin/docker-compose
   - sudo apt update && sudo apt install -y expect
   - sudo pip install --upgrade pip && sudo pip install yamllint
+  - npm install -g eclint
 install:
   - make lint
   - "./test.exp"