OFStateManager: rewrite ind_core_ft_{dump,show} to not use ind_core_ft_iter

ind_core_ft_iter is going away. The new output is more useful because it shows
the correct actions list even if the flow has been modified, and it can show
the stats, flow id, and table id which are not included in the flow-mod.
OFStateManager: remove ind_core_ft_iter

This function was only used by ind_core_ft_dump/ind_core_ft_show. It was
problematic because it passed the original flow add to the callback, but that
message is incomplete, possibly out of date due to flow-modifies, and will soon
be removed from the flowtable entry.
Merge into master from pull request #26:
remove ind_core_ft_iter (https://github.com/floodlight/indigo/pull/26)