Merge #12861: [tests] Stop feature_block.py from blowing up memory.

89fe5feea2 [tests] Stop feature_block.py from blowing up memory. (John Newbery)

Pull request description:

  The new P2PDataStore class was sending full blocks in headers messages,
  which meant that calls to send_blocks_and_test() would blow up memory if
  called with a large number of blocks. Fix that by only sending headers
  in headers messages.

  This means that python should use just over 1GB for feature_block.py (with bitcoind also using just over 1GB). That's the same as before the feature_block.py refactor.

Tree-SHA512: 796ea35584748ceb7b8fa36c732a461fb924dafe0b4c52d3eccf21a00fbdb65aef41ce1d91f027aad50cde6df5d30e985aaef474cb743975c06762975469cbbb

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