p2p: exclude self from GetPeers results

[algorandskiy]

Summary

While running DevNet tests I've noticed a node might emit TxSync request to self that does not make any sense.
Fixed by filtering out node's own peerID from peerstore output.

Note, wsnet implementation is not modified because it cannot reliable identify self from DNS (and possible phonebook.json) input.

Test Plan

TODO

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 56.26%. Comparing base (eff5fb4) to head (e2adb71).

Files with missing lines	Patch %	Lines
network/p2pNetwork.go	0.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6132      +/-   ##
==========================================
+ Coverage   55.99%   56.26%   +0.27%     
==========================================
  Files         494      494              
  Lines       69958    69962       +4     
==========================================
+ Hits        39174    39367     +193     
+ Misses      28077    27920     -157     
+ Partials     2707     2675      -32     

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