Fix unit tests against Puppet 4.3.0

Related-bug: #1517805
Change-Id: I19e891ecce2bceb20e141199e14333f01b0ec9ab
Signed-off-by: Gael Chamoulaud <gchamoul@redhat.com>

spec/classes/glance_spec.rb

@@ -52,7 +52,8 @@ describe 'glance' do
   describe 'on RedHat platforms' do
     let :facts do
       @default_facts.merge({
-        :osfamily => 'RedHat',
+        :osfamily               => 'RedHat',
+        :operatingsystemrelease => '7',
       })
     end
     let(:params) { default_params }