Ergonomic fixes to tensorflow::dump_graph::*
Ergonomic fixes to tensorflow::dump_graph::*

 - Teach the routines to create the dump directories if they don't exist.  I
   routinely forget to create the dump directory before launching the model.
 - Print out the file locations on LOG(INFO) and the error messages on
   LOG(WARNING).

PiperOrigin-RevId: 206192822

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