[puppet][legacy] fix spec tests for older puppets.

Author: truthbk

spec/defines/datadog_agent__integration_spec.rb

@@ -19,7 +19,7 @@
     if gem_spec.version >= Gem::Version.new('4.0.0')
       it { should contain_file('/etc/dd-agent/conf.d/test.yaml').with_content(/---\ninit_config: \ninstances:\n- one: two\n/) }
     else
-      it { should contain_file('/etc/dd-agent/conf.d/test.yaml').with_content(/---\n  init_config: \n  instances:\n    - one: two\n/) }
+      it { should contain_file('/etc/dd-agent/conf.d/test.yaml').with_content(/--- \n  init_config: \n  instances:\n    - one: two/) }
     end
     it { should contain_file('/etc/dd-agent/conf.d/test.yaml').that_notifies("Service[datadog-agent]") }
 end