Non-http dumb protocols

Do we actually support local-fetch and ssh-fetch/ssh-push any more? They 
seem to me to have been entirely supplanted with respect to functionality 
for a long time now, but the programs are still there. This complicates 
http-fetch, because only one -fetch can be linked into a binary as 
currently designed, and we may want to make http-fetch builtin at some 
point. Can we remove the other dumb protocols and merge fetch.c into 
http-fetch.c?

	-Daniel
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