Add test case for dataflow to test action input

  Closes-Bug: 1396461

  Description:

    * Action input specified inline should work with dots.
      For example, action: std.echo output="{$.farewell}.Amigo"
    * Amended test case in dataflow tests to account for above.

Change-Id: Ie78273854d8bcbca5033266f98ce53e7544dd61f