[BACKPORT/22.1.x] net-runner: Add --fixture.default.runtime.version

[matevz]

Backport of #4813 and #4816.

[codecov]

Codecov Report

Merging #4815 (f46c4d0) into stable/22.1.x (5a79ac2) will increase coverage by 0.06%.
The diff coverage is n/a.

❗ Current head f46c4d0 differs from pull request most recent head e3a3ae5. Consider uploading reports for the commit e3a3ae5 to get more accurate results

@@                Coverage Diff                @@
##           stable/22.1.x    #4815      +/-   ##
=================================================
+ Coverage          67.03%   67.09%   +0.06%     
=================================================
  Files                435      435              
  Lines              49252    49252              
=================================================
+ Hits               33016    33046      +30     
+ Misses             12164    12138      -26     
+ Partials            4072     4068       -4     

Impacted Files	Coverage Δ
go/consensus/tendermint/full/light.go	57.69% <0.00%> (-3.85%)	⬇️
go/runtime/host/protocol/connection.go	69.17% <0.00%> (-3.76%)	⬇️
go/worker/common/committee/keymanager.go	88.33% <0.00%> (-3.34%)	⬇️
...consensus/tendermint/apps/roothash/transactions.go	66.66% <0.00%> (-3.12%)	⬇️
go/runtime/registry/host.go	69.38% <0.00%> (-2.86%)	⬇️
go/oasis-node/cmd/ias/auth_registry.go	65.81% <0.00%> (-2.57%)	⬇️
go/worker/storage/committee/checkpoint_sync.go	65.27% <0.00%> (-2.52%)	⬇️
go/worker/keymanager/p2p/client.go	80.95% <0.00%> (-2.39%)	⬇️
go/worker/common/committee/node.go	59.74% <0.00%> (-1.78%)	⬇️
go/worker/client/service.go	70.58% <0.00%> (-1.31%)	⬇️
... and 21 more

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