Add test to trigger Travis build

test/integration/syslog_ng/controls/syslog_ng.rb

@@ -5,3 +5,7 @@ title 'Test SyslogNG installation'
 describe package('syslog-ng') do
   it { should be_installed }
 end
+
+describe file('/etc/syslog-ng/syslog-ng.conf') do
+  it { should exist }
+end