Fix bug report spec to not print stuff on jruby
Fix bug report spec to not print stuff on jruby

And an associated warning: the `out:` argument to `system` is
unsupported there.

mrjman/activeadmin,activeadmin/activeadmin,vraravam/activeadmin,javierjulio/activeadmin,activeadmin/activeadmin,vraravam/activeadmin,mrjman/activeadmin,deivid-rodriguez/activeadmin,mrjman/activeadmin,deivid-rodriguez/activeadmin,vraravam/activeadmin,javierjulio/activeadmin,activeadmin/activeadmin,deivid-rodriguez/activeadmin,javierjulio/activeadmin