test: fix rubocop violations

Use method:

1. `rubocop -a --safe`
2. `rubocop -A --safe`
3. Use `rubocop:disable`

```
Offenses:

test/integration/default/controls/config_spec.rb:1:1: C: Style/FrozenStringLiteralComment: Missing frozen string literal
comment.
control 'Php configuration' do
^
test/integration/default/controls/config_spec.rb:4:3: C: Metrics/AbcSize: Assignment Branch Condition size for
test_debian is too high. [<0, 26, 0> 26/17]
(http://c2.com/cgi/wiki?AbcMetric, https://en.wikipedia.org/wiki/ABC_Software_Metric)
  def test_debian ...
  ^^^^^^^^^^^^^^^
test/integration/default/controls/config_spec.rb:4:3: C: Metrics/MethodLength: Method has too many lines. [14/10]
(https://rubystyle.guide#short-methods)
  def test_debian ...
  ^^^^^^^^^^^^^^^
test/integration/default/controls/config_spec.rb:24:3: C: Style/EmptyMethod: Put empty method definitions on a single
line. (https://rubystyle.guide#no-single-line-methods)
  def test_redhat ...
  ^^^^^^^^^^^^^^^
test/integration/default/controls/config_spec.rb:27:3: C: Style/EmptyMethod: Put empty method definitions on a single
line. (https://rubystyle.guide#no-single-line-methods)
  def test_suse ...
  ^^^^^^^^^^^^^
test/integration/default/controls/package_spec.rb:1:1: C: Style/FrozenStringLiteralComment: Missing frozen string
literal comment.
control 'Php package' do
^
test/integration/default/controls/package_spec.rb:4:3: C: Metrics/AbcSize: Assignment Branch Condition size for
test_debian is too high. [<1, 26, 1> 26.04/17] (http://c2.com/cgi/wiki?AbcMetric,
https://en.wikipedia.org/wiki/ABC_Software_Metric)
  def test_debian ...
  ^^^^^^^^^^^^^^^
test/integration/default/controls/package_spec.rb:4:3: C: Metrics/MethodLength: Method has too many lines. [20/10]
(https://rubystyle.guide#short-methods)
  def test_debian ...
  ^^^^^^^^^^^^^^^
test/integration/default/controls/package_spec.rb:21:1: C: Layout/EmptyLinesAroundBlockBody: Extra empty line detected
at block body beginning. (https://rubystyle.guide#empty-lines-around-bodies)
test/integration/default/controls/service_spec.rb:1:1: C: Style/FrozenStringLiteralComment: Missing frozen string
literal comment.
control 'Php service' do
^
test/integration/default/controls/service_spec.rb:16:3: C: Style/EmptyMethod: Put empty method definitions on a single
line. (https://rubystyle.guide#no-single-line-methods)
  def test_redhat ...
  ^^^^^^^^^^^^^^^
test/integration/default/controls/service_spec.rb:19:3: C: Style/EmptyMethod: Put empty method definitions on a single
line. (https://rubystyle.guide#no-single-line-methods)
  def test_suse ...
  ^^^^^^^^^^^^^

7 files inspected, 12 offenses detected, 8 offenses auto-correctable
```

test/integration/default/controls/config_spec.rb

@@ -1,6 +1,9 @@
+# frozen_string_literal: true
+
 control 'Php configuration' do
   title 'should match desired lines'
 
+  # rubocop:disable Metrics/MethodLength, Metrics/AbcSize
   def test_debian
     describe file('/etc/php/5.6/fpm/pool.d/radius-admin.conf') do
       its('content') { should include '[radius-admin]' }
@@ -20,12 +23,11 @@ control 'Php configuration' do
       its('content') { should include 'date.timezone = Europe/Paris' }
     end
   end
+  # rubocop:enable Metrics/MethodLength, Metrics/AbcSize
 
-  def test_redhat
+  def test_redhat; end
-  end
 
-  def test_suse
+  def test_suse; end
-  end
 
   case os[:family]
   when 'debian'

test/integration/default/controls/package_spec.rb

@@ -1,6 +1,9 @@
+# frozen_string_literal: true
+
 control 'Php package' do
   title 'should be installed'
 
+  # rubocop:disable Metrics/MethodLength, Metrics/AbcSize
   def test_debian
     describe package('php-imagick') do
       it { should be_installed }
@@ -18,7 +21,6 @@ control 'Php package' do
       bz2 cli curl fpm gd imap intl mbstring
       mysql readline xml zip
     ].each do |pkg|
-
       describe package("php5.6-#{pkg}") do
         it { should be_installed }
       end
@@ -28,6 +30,7 @@ control 'Php package' do
       end
     end
   end
+  # rubocop:enable Metrics/MethodLength, Metrics/AbcSize
 
   def test_redhat
     describe package('php') do

test/integration/default/controls/service_spec.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 control 'Php service' do
   title 'should be running and enabled'
 
@@ -13,11 +15,9 @@ control 'Php service' do
     end
   end
 
-  def test_redhat
+  def test_redhat; end
-  end
 
-  def test_suse
+  def test_suse; end
-  end
 
   case os[:family]
   when 'debian'