VM: Refactor pricelist to be based on network versions

[arajasek]

Related Issues

Partially addresses #6652

This was motivated by trying to sync the new FVM-based caterpillarnet using the LegacyVM. The 2 VMs are expected to interoperate, but don't, because the LegacyVM expects to use the "old" (genesis) pricelist, which is wrong for network v15.

Proposed Changes

The proposed change is to make pricelist selection based on both epoch and network version. For anything after network v8, we can select the pricelist based on the version.

The epoch-based selection is preserved for backwards compatibility alone.

Additional Info

Checklist

Before you mark the PR ready for review, please make sure that:

• All commits have a clear commit message.
• The PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, INTERFACE BREAKING CHANGE, CONSENSUS BREAKING, build, chore, ci, docs,perf, refactor, revert, style, test
  • area: api, chain, state, vm, data transfer, market, mempool, message, block production, multisig, networking, paychan, proving, sealing, wallet, deps
• This PR has tests for new functionality or change in behaviour
• If new user-facing features are introduced, clear usage guidelines and / or documentation updates should be included in https://lotus.filecoin.io or Discussion Tutorials.
• CI is green

[magik6k]

Or not quite approve, CI is angry

Failed
=== RUN   TestMessagePool
2022-03-25T00:00:23.133Z	INFO	messagepool	messagepool/messagepool.go:439	mpool ready
    messagepool_test.go:261: getting network version: Epoch 1 has no defined network version
--- FAIL: TestMessagePool (0.00s)

[codecov]

Codecov Report

Merging #8369 (0bfbcfb) into master (11db419) will decrease coverage by 0.02%.
The diff coverage is 65.21%.

@@            Coverage Diff             @@
##           master    #8369      +/-   ##
==========================================
- Coverage   40.21%   40.18%   -0.03%     
==========================================
  Files         684      684              
  Lines       74557    74565       +8     
==========================================
- Hits        29985    29967      -18     
- Misses      39342    39364      +22     
- Partials     5230     5234       +4     

Impacted Files	Coverage Δ
chain/vm/fvm.go	0.00% <0.00%> (ø)
chain/vm/mkactor.go	48.48% <0.00%> (ø)
chain/messagepool/selection.go	83.84% <40.00%> (-0.46%)	⬇️
chain/messagepool/messagepool.go	63.90% <50.00%> (+0.13%)	⬆️
chain/consensus/filcns/filecoin.go	52.17% <100.00%> (ø)
chain/messagepool/check.go	76.08% <100.00%> (-1.17%)	⬇️
chain/stmgr/forks.go	47.29% <100.00%> (ø)
chain/vm/gas.go	79.16% <100.00%> (+0.59%)	⬆️
chain/vm/vm.go	62.69% <100.00%> (ø)
chain/events/message_cache.go	87.50% <0.00%> (-12.50%)	⬇️
... and 21 more