RFC: Netx - implement -Xclearcache command line option

[Omair Majid]

Hi,

The attached patch adds the option -Xclearcache to Netx.

ChangeLog:
2009-07-30  Omair Majid  <omajid at redhat.com>

   * rt/net/sourceforge/jnlp/cache/CacheUtil.java
   (clearCache): New function.
   * rt/net/sourceforge/jnlp/resources/Messages.properties: Add
   BXclearcache.
   * rt/net/sourceforge/jnlp/runtime/Boot.java
   Add -Xclearcache to helpMessage.
   (run): Check for option -Xclearcache and call CacheUtil.clearCache.
   * rt/net/sourceforge/jnlp/util/FileUtils.java
   (recursiveDelete): New function.

Any comments?

Cheers,
Omair