SElinux: ensure persistence

Ensure persistence for SElinux booleans so they still exist after an
evental reboot.

Default is to false:
https://github.com/puppetlabs/puppet/blob/master/lib/puppet/type/selboolean.rb#L21

Also, fix an error in unit tests where context names were switched.

Change-Id: I3c9c48fa3aee0b1991780f7250c40aba6e493498

manifests/selinux.pp

@@ -89,7 +89,9 @@ class cloud::selinux (
     }
   }
 
-  selboolean { $booleans : }
+  selboolean { $booleans :
+    persistent => true,
+  }
   selmodule { $modules: }
 
 }

spec/classes/cloud_selinux_spec.rb

@@ -22,7 +22,7 @@ describe 'cloud::selinux' do
 
   shared_examples_for 'manage selinux' do
 
-    context 'with selinux disabled' do
+    context 'with selinux enforcing' do
       before :each do
         facts.merge!( :selinux_current_mode => 'enforcing' )
       end
@@ -54,7 +54,7 @@ describe 'cloud::selinux' do
 
     end
 
-    context 'with selinux enforcing' do
+    context 'with selinux disabled' do
       before :each do
         facts.merge!( :selinux => 'false' )
       end