Fix network issues

[jsdanielh]

• Reduce the number of concurrent dial addresses to 1 in the network,
  which is also the default hence the code won't set any value to it.
  This was detected as the cause of several dials being launch when
  issuing a peer dial and provoking error messages since only one of
  the dial actions succeed while the other fails with messages
  reporting incoming connection errors.
  This fixes Incoming connection failures when a peer is dialed #446.

• Fix incoming dial failure handling for connection pool behavour.
  Since the recent update of libp2p, this
  change introduces
  state to dial request that can be transmitted in
  inject_dial_failure. So there are a couple of cases where the
  function is called but we can ignore the error since the connection
  is still to be completed or is already connected.
  This fixes Dialing a peer sometime results in an error #447.

Pull request checklist

• All tests pass. Demo project builds and runs.
• I have resolved any merge conflicts.

[codecov]

Codecov Report

Merging #448 (56b0bc9) into albatross (03c3c2b) will increase coverage by 0.13%.
The diff coverage is 0.00%.

❗ Current head 56b0bc9 differs from pull request most recent head 3a329d3. Consider uploading reports for the commit 3a329d3 to get more accurate results

@@              Coverage Diff              @@
##           albatross     #448      +/-   ##
=============================================
+ Coverage      29.51%   29.65%   +0.13%     
=============================================
  Files            348      348              
  Lines          33513    33514       +1     
  Branches       15355    15356       +1     
=============================================
+ Hits            9891     9938      +47     
- Misses         15183    15205      +22     
+ Partials        8439     8371      -68     

Flag	Coverage Δ
unittests	29.64% <0.00%> (+0.13%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
network-libp2p/src/connection_pool/behaviour.rs	28.06% <0.00%> (+0.14%)	⬆️
network-libp2p/src/network.rs	22.81% <ø> (+0.46%)	⬆️
...rimitives/transaction/src/account/basic_account.rs	41.66% <0.00%> (-4.17%)	⬇️
blockchain/src/blockchain/accounts.rs	53.33% <0.00%> (-2.67%)	⬇️
consensus/src/messages/handlers.rs	23.47% <0.00%> (-2.61%)	⬇️
network-libp2p/src/discovery/behaviour.rs	51.96% <0.00%> (-1.97%)	⬇️
blockchain/src/chain_info.rs	54.90% <0.00%> (-1.97%)	⬇️
primitives/account/src/basic_account.rs	51.88% <0.00%> (-1.89%)	⬇️
network-interface/src/peer_map.rs	39.81% <0.00%> (-1.86%)	⬇️
...imitives/account/src/staking_contract/validator.rs	50.82% <0.00%> (-1.33%)	⬇️
... and 35 more

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[vlvrd]

LGTM, there's a warning on the network.rs file because the NonZeroU8 import is no longer needed.