Add docstrings for use_relay/use_auto_relay, add them to hivemind-cli

[borzunov]

No description provided.

[codecov]

Codecov Report

Merging #547 (4a87e46) into master (2a71fda) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #547      +/-   ##
==========================================
+ Coverage   75.97%   75.98%   +0.01%     
==========================================
  Files          81       81              
  Lines        7978     7982       +4     
==========================================
+ Hits         6061     6065       +4     
  Misses       1917     1917              

Impacted Files	Coverage Δ
hivemind/hivemind_cli/run_dht.py	0.00% <0.00%> (ø)
hivemind/hivemind_cli/run_server.py	0.00% <0.00%> (ø)
hivemind/p2p/p2p_daemon.py	94.45% <ø> (ø)
hivemind/dht/protocol.py	92.23% <0.00%> (-0.92%)	⬇️
hivemind/dht/routing.py	94.11% <0.00%> (+0.58%)	⬆️
hivemind/dht/node.py	92.18% <0.00%> (+1.18%)	⬆️