Minor network logging updates

[halfalicious]

• Update RLPxHandshake to log connection direction (egress / ingress) via boost log attribute (fix Use boost log attributes when logging RLPX handshake messages #5573)
• Log abridged block hashes on genesis block hash mismatch during Ethereum peer validation

[halfalicious]

Same test is failing on linux & macos:

521 - network/net/packetsWithChangedEndpointSuite/neighbours (Failed)

Test is known to be unreliable (see #5544 ).

Full failure log:

Running 1 test case...
Test Case "neighbours": 
/home/builder/project/libdevcore/concurrent_queue.h(47): fatal error: in "_T dev::concurrent_queue<_T, _QueueT>::pop(const milliseconds&) [with _T = std::vector<unsigned char>; _QueueT = std::queue<std::vector<unsigned char>, std::deque<std::vector<unsigned char>, std::allocator<std::vector<unsigned char> > > >; std::chrono::milliseconds = std::chrono::duration<long int, std::ratio<1l, 1000l> >]": boost::exception_detail::clone_impl<dev::WaitTimeout>: /home/builder/project/libdevcore/concurrent_queue.h(47): Throw in function _T dev::concurrent_queue<_T, _QueueT>::pop(const milliseconds&) [with _T = std::vector<unsigned char>; _QueueT = std::queue<std::vector<unsigned char>, std::deque<std::vector<unsigned char>, std::allocator<std::vector<unsigned char> > > >; std::chrono::milliseconds = std::chrono::duration<long int, std::ratio<1l, 1000l> >]
Dynamic exception type: boost::exception_detail::clone_impl<dev::WaitTimeout>

/home/builder/project/test/unittests/libp2p/net.cpp(1253): last checkpoint: "neighbours" test entry

*** 1 failure is detected (5 failures are expected) in the test module "Master Test Suite"

[codecov-io]

Codecov Report

Merging #5574 into master will decrease coverage by 0.03%.
The diff coverage is 65.85%.

@@            Coverage Diff             @@
##           master    #5574      +/-   ##
==========================================
- Coverage   62.11%   62.08%   -0.04%     
==========================================
  Files         347      347              
  Lines       29101    29038      -63     
  Branches     3299     3287      -12     
==========================================
- Hits        18077    18028      -49     
+ Misses       9843     9831      -12     
+ Partials     1181     1179       -2