Correctly set the context for OS in spec tests

This was flagged by RuboCop Lint/UnusedBlockArgument

Author: ekohl

spec/classes/certs_qpid_router_client_spec.rb

@@ -2,12 +2,14 @@
 
 describe 'certs::qpid_router::client' do
   on_supported_os.each do |os, os_facts|
-    let :facts do
-      os_facts
-    end
+    context "on #{os}" do
+      let :facts do
+        os_facts
+      end
 
-    describe 'with default parameters' do
-      it { should compile.with_all_deps }
+      describe 'with default parameters' do
+        it { should compile.with_all_deps }
+      end
     end
   end
 end

spec/classes/certs_qpid_router_server_spec.rb

@@ -2,12 +2,14 @@
 
 describe 'certs::qpid_router::server' do
   on_supported_os.each do |os, os_facts|
-    let :facts do
-      os_facts
-    end
+    context "on #{os}" do
+      let :facts do
+        os_facts
+      end
 
-    describe 'with default parameters' do
-      it { should compile.with_all_deps }
+      describe 'with default parameters' do
+        it { should compile.with_all_deps }
+      end
     end
   end
 end