[CHIA-1703] ignore ephemeral spends in mempool superset rule

[arvidn]

Purpose:

A transaction that creates an ephemeral coin can currently not be replaced-by-fee such that the ephemeral coin changes. This is because of the superset rule; to replace a transaction, all coins in the original TX must also be spent in the new TX.

Current Behavior:

The superset rule takes all spends into account.

New Behavior:

The superset rule only takes into account spends whose parent is not part of the spend bundle.

[coveralls-official]

Pull Request Test Coverage Report for Build 11718949262

Details

• 11 of 11 (100.0%) changed or added relevant lines in 2 files are covered.
• 37 unchanged lines in 9 files lost coverage.
• Overall coverage decreased (-0.02%) to 90.914%

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Files with Coverage Reduction	New Missed Lines	%
chia/full_node/pending_tx_cache.py	1	96.55%
chia/rpc/rpc_server.py	1	87.67%
chia/wallet/wallet_node.py	1	88.48%
chia/farmer/farmer_api.py	2	94.36%
chia/_tests/core/test_farmer_harvester_rpc.py	2	97.95%
chia/full_node/weight_proof.py	4	90.48%
chia/server/address_manager.py	5	90.48%
chia/server/node_discovery.py	10	79.82%
chia/full_node/full_node.py	11	86.0%

Totals
Change from base Build 11710907999:	-0.02%
Covered Lines:	102863
Relevant Lines:	112911

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💛 - Coveralls

[wjblanke]

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