go/oasis-node/cmd/debug/fixgenesis: Support migrating Node.Roles

[Yawning]

The node.RolesMask bit definitons have changed since the last major
release deployed to the wild, so support migrating things by rewriting
the node descriptor.

Note: This assumes that signature validation in InitChain is disabled.

[codecov]

Codecov Report

Merging #2620 into master will decrease coverage by 0.14%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #2620      +/-   ##
==========================================
- Coverage   63.32%   63.17%   -0.15%     
==========================================
  Files         360      360              
  Lines       33968    33972       +4     
==========================================
- Hits        21509    21462      -47     
- Misses       9822     9867      +45     
- Partials     2637     2643       +6

Impacted Files	Coverage Δ
go/oasis-node/cmd/debug/fixgenesis/fixgenesis.go	8.53% <0%> (-0.44%)	⬇️
go/worker/common/host/interface.go	38.46% <0%> (-15.39%)	⬇️
go/consensus/api/grpc.go	57.02% <0%> (-6.62%)	⬇️
go/control/debug.go	67.74% <0%> (-6.46%)	⬇️
go/worker/common/host/protocol/protocol.go	65.67% <0%> (-2.99%)	⬇️
go/storage/metrics.go	73.21% <0%> (-2.68%)	⬇️
go/storage/mkvs/urkel/lookup.go	72.72% <0%> (-2.28%)	⬇️
go/worker/compute/txnscheduler/committee/node.go	62.02% <0%> (-2.22%)	⬇️
go/worker/common/p2p/p2p.go	68.46% <0%> (-1.81%)	⬇️
go/consensus/tendermint/tendermint.go	64.57% <0%> (-1.4%)	⬇️
... and 7 more

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