[REEF-1264] Fix NuGet script issue
[REEF-1264] Fix NuGet script issue

This change removes variable ThisNugetPackagePath and replaces its uses
with actual path. This variable was defined before REEF_NugetVersion and
thus contained incorrect value (with missing version).

JIRA:
  [REEF-1264](https://issues.apache.org/jira/browse/REEF-1264)

This closes #909

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