Remove the comments around these assignments; otherwise, we won't get
function pointers set to the _map functions, and we get segv's in MTT
testing (e.g., the C++ suite, which actually calls MPI_Cart_map and
MPI_Graph_map).

cmr=v1.7.4:reviewer=bosilca:subject=Fix topo _map function pointer assignments
We stripped the process info packing routine to minimize message size when sending the launch message, but tools still require all the info. So modify the tool-hnp handshake to explicitly add the missing info

Refs #3992
Support user-provided envars for comm_spawn using info key "env"

Thanks to Tom Fogal for the request

cmr=v1.7.4:reviewer=jsquyres