RFR 8166139/10, Refactor java/net shell cases to java

[Felix Yang]

Hi there,

    please review following patch to convert all shell cases under 
java/net to plain java codes.

Webrev:

     http://cr.openjdk.java.net/~xiaofeya/8166139/webrev.00/

Bug:

     https://bugs.openjdk.java.net/browse/JDK-8166139


Thanks,

Felix