oasis-net-runner: Fix fixtures without a keymanager

[ptrus]

Fixes: #4533

[codecov]

Codecov Report

Merging #4564 (0de481e) into master (e879e2a) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4564      +/-   ##
==========================================
- Coverage   67.00%   66.96%   -0.05%     
==========================================
  Files         424      424              
  Lines       47970    47970              
==========================================
- Hits        32143    32121      -22     
- Misses      11887    11910      +23     
+ Partials     3940     3939       -1     

Impacted Files	Coverage Δ
...onsensus/tendermint/apps/beacon/state/state_vrf.go	73.33% <0.00%> (-13.34%)	⬇️
go/consensus/tendermint/abci/state/state.go	61.53% <0.00%> (-7.70%)	⬇️
go/runtime/host/sandbox/sandbox.go	59.15% <0.00%> (-6.70%)	⬇️
go/worker/beacon/tx_retry.go	90.47% <0.00%> (-4.77%)	⬇️
go/runtime/host/multi/multi.go	70.58% <0.00%> (-4.42%)	⬇️
go/worker/beacon/worker_vrf.go	64.34% <0.00%> (-3.48%)	⬇️
go/worker/storage/p2p/sync/server.go	74.19% <0.00%> (-3.23%)	⬇️
go/sentry/api/grpc.go	40.62% <0.00%> (-3.13%)	⬇️
go/worker/keymanager/watcher.go	63.07% <0.00%> (-3.08%)	⬇️
go/common/grpc/grpc.go	81.95% <0.00%> (-2.96%)	⬇️
... and 14 more

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