go/oasis-node: Make sure the node only tries to stop once

[kostko]

No description provided.

[codecov]

Codecov Report

Merging #2964 into master will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2964      +/-   ##
==========================================
+ Coverage   68.30%   68.43%   +0.12%     
==========================================
  Files         361      361              
  Lines       35231    35231              
==========================================
+ Hits        24065    24110      +45     
+ Misses       8057     8026      -31     
+ Partials     3109     3095      -14     

Impacted Files	Coverage Δ
go/oasis-node/cmd/node/node.go	51.62% <100.00%> (-2.80%)	⬇️
go/consensus/tendermint/abci/mux.go	62.90% <0.00%> (-6.00%)	⬇️
go/consensus/tendermint/abci/state.go	65.81% <0.00%> (-2.19%)	⬇️
go/worker/common/p2p/p2p.go	64.41% <0.00%> (-1.81%)	⬇️
go/storage/mkvs/syncer/proof.go	83.92% <0.00%> (-1.79%)	⬇️
go/consensus/tendermint/apps/staking/fees.go	45.98% <0.00%> (-1.46%)	⬇️
go/consensus/tendermint/apps/staking/staking.go	54.28% <0.00%> (-1.43%)	⬇️
go/storage/mkvs/cache.go	82.97% <0.00%> (-0.86%)	⬇️
...o/consensus/tendermint/apps/staking/state/state.go	58.25% <0.00%> (-0.40%)	⬇️
... and 21 more

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