Use default port 8023 instead of 23 in echo
server example.

Examples and tests should not assume a
privileged user runs them.

Backport of r1441886 from tcnative trunk.


git-svn-id: https://svn.apache.org/repos/asf/tomcat/native/branches/1.1.x@1441887 13f79535-47bb-0310-9956-ffa450edef68
Add some notes on how to run tests to cnative.


git-svn-id: https://svn.apache.org/repos/asf/tomcat/native/branches/1.1.x@1441889 13f79535-47bb-0310-9956-ffa450edef68