The ServerConnector class doesn’t exist in Jetty 8 so we have to
resort to reflection to create and configure a SelectChannelConnector
instead.
Closes gh-5649
See gh-5380
Switch the Tomcat 8 and Jetty 9 samples to Tomcat 7 and Jetty 8. Since
Tomcat 8 and Jetty 9 are now the default versions the previous samples
are no longer relevant, however, we do need integration tests to check
that we remain compatible with Tomcat 7 and Jetty 8.
See gh-1832