[bisq-network/bitcoinj] Bisq’s bitcoinj tor/onion changes audit (#25)

[Oscar Guindzberg]

Overview
- Changes done on bisq's bitcoinj just support onion v2 addresses.
- Most of the code needed to support tor/onion services is in https://github.com/bisq-network/bisq (out of scope of this audit)
- Upstream tor support in bitcoinj was removed because it was not well maintained and caused problems and there were no volunteers to maintain it (https://github.com/bitcoinj/bitcoinj/pull/1314)
- Tor support could be re-enabled upstream by contributing changes done on bisq's bitcoinj and on https://github.com/bisq-network/bisq
- Tor support upstream could provide
  - Connect to peers running behind an onion address
  - Resolve DNS over tor
  - Connect via tor to clearnet peers
  - A mechanism to start a local tor client (orchid or another tor client) 

Commit review
- https://github.com/bisq-network/bitcoinj/commit/011fe40d971631106980c28df3ed8a51e7e875f6 
  - No changes suggested.
  - Created PR upstream https://github.com/bitcoinj/bitcoinj/pull/1741 
- https://github.com/bisq-network/bitcoinj/commit/834f57a1c17758f46bddb8335f009f010c95ba41 
  - No changes suggested.
  - Created PR upstream https://github.com/bitcoinj/bitcoinj/pull/1742 
- https://github.com/bisq-network/bitcoinj/commit/0988148bbb05e1d11e718aa421855ee7629d0778
  - No changes suggested.
- https://github.com/bisq-network/bitcoinj/commit/9f09a8953469bfdbf809384f1c91dab953fe284d 
  - See https://github.com/bisq-network/bitcoinj/pull/24

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