Consider to disable sendfile capability in Tomcat configuration

[skabashnyuk]

For tomcat there is a tradeoff between using compression (saving your bandwidth) and using the sendfile feature (saving your CPU cycles)
I think bandwidth is a bit more important for us in compression of CPU cycles.
See more https://tomcat.apache.org/tomcat-8.0-doc/config/http.html

By disabling sendfile capability we will turn on compression for files larger 48Kb

[skabashnyuk]

Already working on codenvy. I don't see profits on enabling this in Che. In some of my tests, load time was bigger for Che.