Feature/more test coverage

Before:

```
ChefSpec Coverage report generated...

  Total Resources:   84
  Touched Resources: 74
  Touch Coverage:    88.1%

Untouched Resources:

  yum_repository[HDP-2.x]            hadoop/recipes/repo.rb:74
  yum_repository[Updates-HDP-2.x]    hadoop/recipes/repo.rb:90
  yum_repository[HDP-UTILS-1.1.0.17]   hadoop/recipes/repo.rb:98
  yum_repository[cloudera-cdh5]      hadoop/recipes/repo.rb:144
  directory[/tmp/hadoop-mapred/local]   hadoop/recipes/hadoop_mapreduce_jobtracker.rb:39
  file[/usr/lib/hadoop-yarn/bin/container-executor]   hadoop/recipes/hadoop_yarn_nodemanager.rb:43
  execute[yarn-remote-app-log-dir]   hadoop/recipes/hadoop_yarn_resourcemanager.rb:51
  apt_repository[hdp]                hadoop/recipes/repo.rb:120
  apt_repository[hdp-utils]          hadoop/recipes/repo.rb:127
  service[zookeeper-server]          hadoop/recipes/zookeeper_server.rb:173
```

After:

```
ChefSpec Coverage report generated...

  Total Resources:   84
  Touched Resources: 78
  Touch Coverage:    92.86%

Untouched Resources:

  yum_repository[HDP-2.x]            hadoop/recipes/repo.rb:74
  yum_repository[Updates-HDP-2.x]    hadoop/recipes/repo.rb:90
  yum_repository[HDP-UTILS-1.1.0.17]   hadoop/recipes/repo.rb:98
  yum_repository[cloudera-cdh5]      hadoop/recipes/repo.rb:144
  apt_repository[hdp]                hadoop/recipes/repo.rb:120
  apt_repository[hdp-utils]          hadoop/recipes/repo.rb:127
```