Fix system property name for pipe window size
Fix system property name for pipe window size

Previously, the system property name was
"class hudson.remoting.Channel.pipeWindowSize", which is very confusing
and difficult to set from the command-line.

Use Class.getName() instead of Class.toString(), so the new property
name will be "hudson.remoting.Channel.pipeWindowSize".

jenkinsci/remoting,oleg-nenashev/remoting,jenkinsci/remoting,oleg-nenashev/remoting