fix tests for NoMethodError being properly thrown in dsl_exec and load_dsl_file
fix tests for NoMethodError being properly thrown in dsl_exec and load_dsl_file

Recent ruby 1.9 versions raise NameError if an undefined call can
either be a method or local variable missing. Append () to make
sure that it gets interpreted as a method call.

orocos-toolchain/utilrb-ext,orocos-toolchain/utilrb-ext