cluster, dm: format semver input

[AstroProfundis]

What problem does this PR solve?

1. prepend v to bare version number, so that v4.0.8 and 4.0.8 are both valid input
2. validate input version to ensure it's a valid semver string

Close #350

Check List

Tests

• Integration test
• Manual test (add detailed scripts or steps below)

Release notes:

cluster, dm: support version input without leading 'v'

[codecov-io]

Codecov Report

Merging #1009 (4645a43) into master (b693df4) will increase coverage by 0.06%.
The diff coverage is 45.45%.

@@            Coverage Diff             @@
##           master    #1009      +/-   ##
==========================================
+ Coverage   55.63%   55.69%   +0.06%     
==========================================
  Files         280      280              
  Lines       19741    19749       +8     
==========================================
+ Hits        10982    10999      +17     
+ Misses       7049     7043       -6     
+ Partials     1710     1707       -3     

Flag	Coverage Δ
cluster	43.64% <25.00%> (+0.11%)	⬆️
dm	23.98% <60.00%> (+0.01%)	⬆️
integrate	49.97% <45.45%> (+0.09%)	⬆️
playground	20.31% <0.00%> (-0.01%)	⬇️
tiup	16.48% <0.00%> (-0.01%)	⬇️
unittest	22.27% <18.18%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
components/cluster/command/deploy.go	64.28% <33.33%> (-3.22%)	⬇️
components/cluster/command/upgrade.go	75.00% <33.33%> (-10.72%)	⬇️
components/dm/command/deploy.go	68.75% <33.33%> (-4.59%)	⬇️
pkg/utils/semver.go	100.00% <100.00%> (ø)
pkg/cluster/spec/tiflash.go	73.69% <0.00%> (+0.86%)	⬆️
pkg/cluster/api/pdapi.go	59.93% <0.00%> (+1.26%)	⬆️
pkg/cluster/spec/pd.go	69.87% <0.00%> (+2.56%)	⬆️
pkg/cluster/template/scripts/pd.go	71.87% <0.00%> (+3.12%)	⬆️
pkg/utils/http_client.go	72.97% <0.00%> (+5.40%)	⬆️

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[lucklove]

/lgtm

[lucklove]

/merge

[ti-chi-bot]

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

Commit hash: afe2b12

[ti-chi-bot]

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

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 ti-community-infra/ti-community-prow repository.

[lucklove]

/merge

[ti-chi-bot]

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

Commit hash: 4645a43