DNM: TiUP Cluster UI

[baurine]

What problem does this PR solve?

Supply a web UI of tiup cluster component for user to easily deploy and operate a cluster.

What is changed and how it works?

Add a web UI that includes both backend and frontend.

Compile it by:

$ make embed_cluster_ui
$ UI=1 make

Run it by:

$ bin/tiup-cluster --ui

Access http://ip:8080 in the browser.

Check List

Tests

• Manual test (add detailed scripts or steps below)

Code changes

• Has exported function/method change
• Has exported variable/fields change

Side effects

• Increased code complexity

Related changes

• Need to update the documentation

Release notes:

- Supply a web UI of tiup cluster component for user to easily deploy and operate a cluster.

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Merging #706 into master will increase coverage by 2.36%.
The diff coverage is 20.56%.

@@            Coverage Diff             @@
##           master     #706      +/-   ##
==========================================
+ Coverage   51.47%   53.84%   +2.36%     
==========================================
  Files         249      263      +14     
  Lines       20676    21575     +899     
==========================================
+ Hits        10644    11617     +973     
+ Misses       8622     8393     -229     
- Partials     1410     1565     +155     

Flag	Coverage Δ
#cluster	46.09% <20.35%> (-0.75%)	⬇️
#dm	27.03% <39.54%> (+0.12%)	⬆️
#integrate	49.22% <20.56%> (-0.11%)	⬇️
#playground	22.96% <ø> (?)
#tiup	11.28% <0.00%> (-0.01%)	⬇️
#unittest	19.26% <0.91%> (-0.19%)	⬇️

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

Impacted Files	Coverage Δ
components/cluster/command/check.go	79.73% <0.00%> (ø)
components/cluster/web/uiserver/uiserver.go	0.00% <0.00%> (ø)
components/cluster/web/web.go	0.00% <0.00%> (ø)
pkg/cliutil/ssh.go	19.56% <9.09%> (-1.49%)	⬇️
components/cluster/command/root.go	44.02% <25.00%> (-0.87%)	⬇️
pkg/cluster/task/task.go	62.63% <31.25%> (-11.25%)	⬇️
pkg/cluster/manager.go	65.18% <44.66%> (-2.50%)	⬇️
pkg/cluster/task/step.go	78.57% <81.81%> (+0.16%)	⬆️
components/playground/instance/drainer.go	0.00% <0.00%> (ø)
... and 26 more

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[baurine]

Current Progress:

• Enable add/edit/remove machines and components
• Enable deploy a cluster and view its progress
• Enable show a deployed cluster topo and information
• Enable destroy a cluster

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@breeswish @lonng

[lonng]

@baurine Awesome

[ti-chi-bot]

@baurine: PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[AstroProfundis]

/hold

[baurine]

The upstream changes too much so will abandon this PR, and commit a new PR that base on the latest master branch.

[baurine]

Replace it with #1172