Fix loglevel for a message in _read_from_persistent_conn()

[borzunov]

This PR hides the following harmless log message:

[2021/08/25 19:15:06.997][WARN][p2p.p2p_daemon_bindings.control._read_from_persistent_conn:189] Received unexpected response from daemon: callId: ":h\234\204\210\250@\233\223J\013V\232\033z\246"
daemonError {
  message: "context canceled"
}

It happens on every cancelled unary call. A better fix (never send a response to a cancelled call) will be implemented in the next p2p daemon release by @deniskamazur.

[codecov]

Codecov Report

Merging #364 (6d0565c) into master (a1bb356) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #364      +/-   ##
==========================================
- Coverage   83.40%   83.35%   -0.05%     
==========================================
  Files          66       66              
  Lines        6097     6097              
==========================================
- Hits         5085     5082       -3     
- Misses       1012     1015       +3     

Impacted Files	Coverage Δ
hivemind/p2p/p2p_daemon_bindings/control.py	92.54% <100.00%> (ø)
hivemind/dht/node.py	90.69% <0.00%> (-0.72%)	⬇️