Implement checkpoint

[lucklove]

What problem does this PR solve?

Close #1026

What is changed and how it works?

Implement a cache struct (CheckPointExecutor) overlay Executor, which writes the results of Executor to auth log and read them back when in checkpoint mode:

If user specify the --checkpoint flag，the CheckPointExecutor will read all checkpoints from the specified auth log and use them as the cache. After that, when there is a command should be execute in remote, it will check if it's exists in the cache, if so, use the cached result directly, otherwise, call real Executor and records it's result to current auth log.

Check List

Tests

• Unit test

Side effects

• Increased code complexity

Related changes

• Need to update the documentation

Release notes:

NONE

[codecov-io]

Codecov Report

Merging #1069 (d3850c1) into master (d4881ba) will increase coverage by 0.13%.
The diff coverage is 64.81%.

@@            Coverage Diff             @@
##           master    #1069      +/-   ##
==========================================
+ Coverage   56.41%   56.54%   +0.13%     
==========================================
  Files         278      283       +5     
  Lines       19696    19970     +274     
==========================================
+ Hits        11111    11293     +182     
- Misses       6862     6928      +66     
- Partials     1723     1749      +26     

Flag	Coverage Δ
cluster	45.04% <63.50%> (+0.41%)	⬆️
dm	24.78% <41.78%> (+0.43%)	⬆️
integrate	51.00% <63.00%> (+0.24%)	⬆️
playground	20.91% <ø> (ø)
tiup	16.41% <3.48%> (-0.27%)	⬇️
unittest	22.73% <19.85%> (+0.30%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
components/dm/command/import.go	19.04% <0.00%> (-0.31%)	⬇️
components/dm/command/scale_in.go	60.60% <0.00%> (ø)
components/dm/task/update_dm_meta.go	85.29% <ø> (ø)
pkg/cluster/ansible/config.go	0.00% <0.00%> (ø)
pkg/cluster/ansible/service.go	3.62% <0.00%> (-0.02%)	⬇️
pkg/cluster/audit/audit.go	63.46% <ø> (ø)
pkg/cluster/ctxt/event_bus.go	71.42% <ø> (ø)
pkg/cluster/executor/local.go	55.71% <ø> (-0.63%)	⬇️
pkg/cluster/manager/deploy.go	70.35% <0.00%> (ø)
pkg/cluster/manager/scale_in.go	59.52% <0.00%> (ø)
... and 84 more

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[lucklove]

/hold

[lucklove]

/hold cancel

[AstroProfundis]

/lgtm

[AstroProfundis]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: fdc4771

[ti-chi-bot]

@lucklove: Your PR has out-of-dated, I have automatically updated it for you.

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