Make NPM plugin be able to pass-over NPM client query parameters

That is needed for client to perform "cheaper" metadata updates,
incrementally.
Fix exception with HTTP request provider

As when call happens outside of Jetty QTP thread
there is exception thrown that call is out of
scope.
Merge pull request #5 from cstamas/client-query-parameters

Make NPM plugin be able to pass-over NPM client query parameters