Installed Tomcat7, downloaded OpenIG-3.1.0, copied the war file to /var/lib/tomcat7/webapps, started Tomcat7 and seeing the Tomcat7 startup page at localhost:8080, nothing appearing at localhost:8081. Created new directories in /var/lib/tomcat7/webapps: /.openig/config/routes, added config.json and 99-default.json. Still no clue how to test openig.
OpenIG must be deployed as the ROOT context since it is supposed to intercept all calls.
Just try without any configuration (no ~/.openig directory). If you connect to localhost:8080, OpenIG should display a welcome page.
Then you can start configuring it.
The config.json file is looked for in the ~/.openig/config/
The 99-default.json should be located under ~/.openig/config/routes/
I hope this helps.
Otherwise, you will have to look at Tomcat logs to see if there are error messages.