Change --datadir to --appdir and remove symmetrical connection in stability tests

[svarogg]

No description provided.

[codecov]

Codecov Report

Merging #1617 (6a0dcaf) into v0.10.0-dev (cebcab7) will increase coverage by 0.02%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           v0.10.0-dev    #1617      +/-   ##
===============================================
+ Coverage        59.99%   60.02%   +0.02%     
===============================================
  Files              516      516              
  Lines            20494    20494              
===============================================
+ Hits             12296    12301       +5     
+ Misses            6245     6239       -6     
- Partials          1953     1954       +1     

Impacted Files	Coverage Δ
app/protocol/flows/blockrelay/handle_relay_invs.go	70.00% <0.00%> (+1.25%)	⬆️
...ersselectedchainstore/headersselectedchainstore.go	71.02% <0.00%> (+2.80%)	⬆️

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