fix: dynamic route fix

[summer-ji-eng]

Now generator only works for multiple variables in HTTP URI in format like {param1.param2.param3=abc/*/d/*/ef/}. It doesn't support format in /v1/projects/{project_id}/locations/{location}/jobs.

dataflow proto has recent change. Because generator only find the first HTTP request param project_id(client library code), it cause loctation error. The reason is that the routing header misses location to sent x-goog-request-param header in grpc matedata.

To sent the correct the http request parameter, the client library surface code should has change like this:

options.otherArgs.headers['x-goog-request-params'] =
      gax.routingHeader.fromParams({
        project_id: request.projectId || '',
        location: request.location || '',
      });

[summer-ji-eng]

Test should pass once #1132 merged.