network: fixes to public address support

[algorandskiy]

Summary

1. requestTracker changes:

• Remove http.Request.RemoteAddr overwriting in request tracker
• Remove http.Request from request tracker
• Add a new remoteAddresss() method that returns a most suitable address

2. public addr changes:

• no otherPublicAddr outside of requestTracker
• new remoteAddresss() method provides most meaningful address for incoming requests

Rationale:
There is a chain http.Handler's in wsNetwork: request tracker and wsNetwork itself.
Tracked request is created/updated in the first ServeHTTP and used to save a pointer to http.Request object.
This request object is actually gets copied in mux.ServeHTTP that calls downstream wsNetwork's ServeHTTP making
the request non-usable in the main wsNetwork's ServeHTTP so removed.

otherPublicAddr is an address reported by a peer via our custom X-Algorand-Location header that the only
correct value for wsPeer.rootURL (host:port accepting connections) but cannot be trusted.
Unconditionally rewriting it with remoteAddr obtained from a tcp connection is too much and a new
remoteAddresss() method attempts to provide the most meaningful trusted value.

Fixes #5713

Test Plan

1. Existing test must pass
2. Added a new unit test
3. Updated some connection dedup TestPeering tests since they relied on a buggy otherPublicAddr overwriting by remoteAddr.

[codecov]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (f48be99) 55.95% compared to head (793f8ca) 55.92%.
Report is 16 commits behind head on master.

Files	Patch %	Lines
network/requestTracker.go	73.68%	3 Missing and 2 partials ⚠️
network/wsNetwork.go	54.54%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5851      +/-   ##
==========================================
- Coverage   55.95%   55.92%   -0.03%     
==========================================
  Files         477      477              
  Lines       67346    67355       +9     
==========================================
- Hits        37683    37671      -12     
- Misses      27117    27131      +14     
- Partials     2546     2553       +7     

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[jasonpaulos]

This seems better. Just putting in some minor corrections