SH-4368 Adjust upload timeout parameters for slow networks.

Generally sorted the mesh timeout parameters for maximum
transport time (staying with default 30 for connect).  60S
for normal meshes, 600S for large.  Also documented default
option values in httpoptions.h.  Useful to have these.  In
the future, the timeouts might go into standard llsd options
where they can be tracked a bit more.