fix(rubocop): add fixes using rubocop --safe-auto-correct

Author: myii

test/integration/default/controls/config_spec.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 control 'InfluxDB configuration' do
   title 'should match desired lines'
 

test/integration/default/controls/package_spec.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 control 'InfluxDB package' do
   title 'should be installed'
 

test/integration/default/controls/service_spec.rb

@@ -1,9 +1,10 @@
+# frozen_string_literal: true
+
 control 'InfluxDB service' do
   title 'should be running and enabled'
 
   describe service('influxdb') do
     it { should be_enabled }
     it { should be_running }
   end
-
 end