(maint) fix failing tests due to rspec changes

This test was failing due to some changes on
rspec-expectactions gems.
More info here: rspec/rspec-expectations#1134

Author: gimmyxd

spec/classes/puppet_agent_spec.rb

@@ -298,7 +298,7 @@ def global_facts(facts, os)
       end
       let(:params) { global_params }
 
-      it { is_expected.to raise_error(Puppet::Error, %r{Nexenta not supported}) }
+      it { expect { catalogue }.to raise_error(Puppet::Error, %r{Nexenta not supported}) }
     end
   end
 end