p2p: make sure p2p http server runs on all interfaces

[algorandskiy]

Summary

libp2phttp server rejects to run when no listen addresses can be determined and no ListenAddrs provided. After filtering out all non-routable and private addresses via address factory in host.Addrs(), our http server failed to start since host.Addrs() returned empty.
Fixed by handling this situation explicitly in MakeHTTPServer and providing 0.0.0.0 via ListenAddrs.

Note, if NetAddress is set to some specific address, all this new logic is not executed - http server will start on the NetAddress interface as before this change.

Test Plan

Added an explicit unit test for this NetAddress = ":0" case

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 56.18%. Comparing base (b1d81bc) to head (afa9785).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
network/p2p/http.go	0.00%	5 Missing ⚠️
network/p2p/p2p.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6123      +/-   ##
==========================================
+ Coverage   56.14%   56.18%   +0.04%     
==========================================
  Files         494      494              
  Lines       69931    69936       +5     
==========================================
+ Hits        39266    39297      +31     
+ Misses      27987    27963      -24     
+ Partials     2678     2676       -2     

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[cce]

Does this /ip4/0.0.0.0/tcp/0/http mean it will pick a different port from libp2p or the same one?

[algorandskiy]

It is not used from what I see in the source code, it gets a listener from basic_host but checks ListenAddrs for empty. But I agree, it is better to use the same port as basic_host, I'll followup in another PR.