p2p: support EnableGossipService in p2p streams

[algorandskiy]

Summary

Added EnableGossipService support to p2p net: stream manager checks connection direction and either does not open a new /algorand-ws/1.0.0 (in Connected notification) or closes incoming stream in a stream handler.

Additionally I removed useless incoming vs outgoing checks with warnings since their assumption are wrong: Connected notification is fired for both incoming and outgoing connections.

Test Plan

Added tests to ensure:

1. Node with EnableGossipService=false can still accept and send traffic
2. Relay and node with EnableGossipService=false cannot communicate.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Project coverage is 56.30%. Comparing base (edda2ee) to head (4673c8b).

Files	Patch %	Lines
network/p2p/streams.go	0.00%	14 Missing ⚠️
network/p2p/p2p.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6073      +/-   ##
==========================================
+ Coverage   55.95%   56.30%   +0.34%     
==========================================
  Files         488      488              
  Lines       69602    69595       -7     
==========================================
+ Hits        38945    39182     +237     
+ Misses      27967    27763     -204     
+ Partials     2690     2650      -40     

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[gmalouf]

One still is receiving blocks and certs when gossip service is disabled right? Do we doublecheck that/is it worth doublechecking that?

[algorandskiy]

Merged master into