Reported by Thomas Keller, Dec 26, 2010

Steps to reproduce the problem:
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$ mtn serve --bind :4691

Expected result:
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beginning service on <all interfaces> : 4691


Actual results:
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mtn: misuse: unable to parse host of URI ':4691'


Output of `mtn version --full`:
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mtn 0.99.1


Problem is in network/connection_info.cc, line526ff and furthermore 
in keys.cc, line 188ff: When we try to figure out the proper key to 
use for netsync (client OR server), we ask the user via 
get_netsync_key. This is however always done with the client 
connection's URI resource, which should not be set at all for the 
server, but which we set (half-wrongly already) to the first --bind 
parameter the user gives us.

To do this properly once and for all, I propose we split up 
get_netsync_key(server, include, exclude) into 
get_client_netsync_key(server, include, exclude) and 
get_server_netsync_key(servers) - the latter carries a table of 
addresses it got via --bind instead of a single address.
To ease the handling of the chosen key somewhat, I think it might be 
a good idea to carry the whatever chosen key afterwards in the 
connection_info struct, shared by both, client and server.