COMM_SPAWN broken in v2.0.x

[jsquyres]

This is a mirror for #2030, but for v2.0.x (instead of v2.1.x).

Keep all general discussion about the issue over on #2030; put any specific v2.0.x information here.

[jsquyres]

It looks like #2215 fixes the issue for v2.x.

@hjelmn Could we get a smaller version of it for v2.0.x? (e.g., leaving out 91337bf)?

[hppritcha]

@jsquyres I think this can be closed since #2381 is merged in.

[hppritcha]

This issue is closed by commit #2215