Do not test Ubuntu 14.04 in the CI

.kitchen.dokken.yml

@@ -13,9 +13,6 @@ provisioner:
   name: dokken
 
 platforms:
-- name: ubuntu-14-04
-  driver:
-    image: ubuntu:14.04
 - name: ubuntu-16-04
   driver:
     image: ubuntu:16.04

.travis.yml

@@ -13,23 +13,18 @@ before_install:
   - gem update --system # see https://github.com/bundler/bundler/issues/5357
 
 env:
- - INSTANCE=ubuntu-14-04
- - INSTANCE=ubuntu-14-04 CHEF_VERSION=12.5.1
- - INSTANCE=ubuntu-16-04
- - INSTANCE=ubuntu-16-04 CHEF_VERSION=12.5.1
- - INSTANCE=centos-6
- - INSTANCE=centos-6 CHEF_VERSION=12.5.1
- - INSTANCE=centos-7
- - INSTANCE=centos-7 CHEF_VERSION=12.5.1
+  - INSTANCE=ubuntu-16-04
+  - INSTANCE=ubuntu-16-04 CHEF_VERSION=12.5.1
+  - INSTANCE=centos-6
+  - INSTANCE=centos-6 CHEF_VERSION=12.5.1
+  - INSTANCE=centos-7
+  - INSTANCE=centos-7 CHEF_VERSION=12.5.1
 
 script:
-  -  KITCHEN_LOCAL_YAML=.kitchen.dokken.yml bundle exec rake kitchen
+  - KITCHEN_LOCAL_YAML=.kitchen.dokken.yml bundle exec rake kitchen
 
 matrix:
   fast_finish: true
-  allow_failures:
-  - env: INSTANCE=ubuntu-14-04
-  - env: INSTANCE=ubuntu-14-04 CHEF_VERSION=12.5.1
   include:
     - env: UNIT_AND_LINT=1
       script: