Support Linting YAML as part of Travis CI build (#554)

* add yamllint command to travis CI

installs and runs a linter across the YAML in the
project to ensure consistency in the written YAML.

this uses yamllint and the default yamllint config with
"truthy" and "line-length" disabled.

* run dos2unix on CRLF files

* YAMLLINT: remove trailing spaces

* YAMLLint: add YAML document start

* YAMLLint: too many spaces around bracket

* YAMLLint: fix indentation

* YAMLLint: remove duplicate key

* YAMLLint: newline at end of file

* YAMLLint: Too few spaces after comma

* YAMLLint: too many spaces after colon

.goreleaser.yml

@@ -1,3 +1,4 @@
+---
 env:
   - GO111MODULE=on
   - KUBEBENCH_CFG=/etc/kube-bench/cfg
@@ -9,8 +10,8 @@ builds:
     goarch:
       - amd64
     ldflags:
-     - "-X github.com/aquasecurity/kube-bench/cmd.KubeBenchVersion={{.Version}}"
-     - "-X github.com/aquasecurity/kube-bench/cmd.cfgDir={{.Env.KUBEBENCH_CFG}}"
+      - "-X github.com/aquasecurity/kube-bench/cmd.KubeBenchVersion={{.Version}}"
+      - "-X github.com/aquasecurity/kube-bench/cmd.cfgDir={{.Env.KUBEBENCH_CFG}}"
 # Archive customization
 archive:
   format: tar.gz

.travis.yml

@@ -2,26 +2,28 @@
 language: go
 
 services:
-  - docker 
+  - docker
 
 notifications:
   email: false
 
 before_install:
   - sudo apt-get -qq update
   - sudo apt-get install -y rpm
+  - pip install --user yamllint==1.18.0
   - gem install --no-ri --no-rdoc fpm
   - go get -t -v ./...
 
 script:
+  - yamllint -c ./.yamllint.yaml .
   - GO111MODULE=on go test ./...
   - IMAGE_NAME=kube-bench make build-docker
-  - docker run -v `pwd`:/host kube-bench install 
+  - docker run -v `pwd`:/host kube-bench install
   - test -d cfg
   - test -f kube-bench
   - make tests
   - make integration-tests
-  
+
 after_success:
   - bash <(curl -s https://codecov.io/bash)
 deploy:

.yamllint.yaml

@@ -0,0 +1,6 @@
+---
+extends: default
+
+rules:
+  line-length: disable
+  truthy: disable

cfg/cis-1.3/config.yaml

@@ -1,2 +1,2 @@
 ---
-## Version-specific settings that override the values in cfg/config.yaml
+## Version-specific settings that override the values in cfg/config.yaml