Minor pos2 updates

[arvidn]

Purpose:

This PR collects a few minor changes, shaved off of my larger PR to integrate v2 plots.

These 3 commits are best reviewed one at a time, and are somewhat independent.

Current Behavior:

• We still have some stub functions for the new chiapos2 API.
• We use log.warning() and log.error() to log exceptions.
• When farming v1 plots we always get the qualities, adjust them based on phase-out and check against difficulty.

New Behavior:

• The last chiapos2 stub APIs have been removed.
• We use log.exception() to log exceptions.
• When farming v1 plots we short cut and ignore them if the block height is past the end of the phase-out. This is an optimization to avoid scanning the plots for proofs that will never pass the difficulty.

[coveralls-official]

Pull Request Test Coverage Report for Build 18877386781

Details

• 8 of 12 (66.67%) changed or added relevant lines in 4 files are covered.
• 44 unchanged lines in 12 files lost coverage.
• Overall coverage decreased (-0.03%) to 90.728%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
chia/simulator/block_tools.py	2	3	66.67%
chia/plot_sync/receiver.py	2	5	40.0%

Files with Coverage Reduction	New Missed Lines	%
chia/full_node/full_node_api.py	1	85.95%
chia/full_node/pending_tx_cache.py	1	96.55%
chia/introducer/introducer.py	1	81.9%
chia/timelord/timelord_api.py	1	93.02%
chia/data_layer/data_layer.py	2	86.1%
chia/types/blockchain_format/proof_of_space.py	2	98.57%
chia/server/server.py	3	84.93%
chia/_tests/core/custom_types/test_proof_of_space.py	3	95.89%
chia/wallet/wallet_node.py	3	86.61%
chia/introducer/introducer_api.py	5	81.48%

Totals
Change from base Build 18847650880:	-0.03%
Covered Lines:	102218
Relevant Lines:	112489

---

💛 - Coveralls

[arvidn]

The test coverage for block_tools.py is because we don't run tests on v2 plots yet. It will be covered once we get there.

[github-actions]

File	Coverage	Missing Lines
chia/harvester/harvester_api.py	66.7%	lines 404
chia/plot_sync/receiver.py	40.0%	lines 116-117, 190
chia/simulator/block_tools.py	50.0%	lines 1557

Total	Missing	Coverage
14 lines	5 lines	64%

[wjblanke]

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