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 56.22%. Comparing base (619d257) to head (23c611a).

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   56.22%   56.22%           
=======================================
  Files         494      494           
  Lines       69954    69958    +4     
=======================================
+ Hits        39330    39334    +4     
+ Misses      27947    27946    -1     
- Partials     2677     2678    +1     

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