[nanocloud] Added async call utility to ZeroRMI

git-svn-id: https://gridkit.googlecode.com/svn/grid-lab/branches/vicluster-0.8@3291 4e96dbfe-9890-11de-ac5d-73b9d092dc0a
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git-svn-id: https://gridkit.googlecode.com/svn/grid-lab/branches/vicluster-0.8@3299 4e96dbfe-9890-11de-ac5d-73b9d092dc0a