Add clean sub command

[lucklove]

Fix #138

TODOLIST:

• Primary cleanup: tidb/tikv/pd/promethus/grafana
• Support skip specific role, eg: prometheus
• Support cleanup log

Introduce `tiup cluster clean` command:

- Cleanup all data in specified cluster: `tiup cluster clean ${cluster-name} --data`
- Cleanup all logs in specified cluster: `tiup cluster clean ${cluster-name} --log`
- Cleanup all logs and data in specified cluster: `tiup cluster clean ${cluster-name} --all`
- Cleanup all logs and data in specified cluster, excepting the prometheus service: `tiup cluster clean ${cluster-name} --all --ignore-role prometheus`
- Cleanup all logs and data in specified cluster, expecting the node `172.16.13.11:9000`: `tiup cluster clean ${cluster-name} --all --ignore-node 172.16.13.11:9000`
- Cleanup all logs and data in specified cluster, expecting the host `172.16.13.11`: `tiup cluster clean ${cluster-name} --all --ignore-node 172.16.13.12`

[codecov-commenter]

Codecov Report

Merging #644 into master will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #644      +/-   ##
==========================================
+ Coverage   57.35%   57.45%   +0.09%     
==========================================
  Files         243      244       +1     
  Lines       17516    17662     +146     
==========================================
+ Hits        10047    10148     +101     
- Misses       6167     6201      +34     
- Partials     1302     1313      +11     

Flag	Coverage Δ
#coverage	57.45% <ø> (+0.09%)	⬆️

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

Impacted Files	Coverage Δ
...src/github.com/pingcap/tiup/pkg/cluster/manager.go	69.37% <0.00%> (-1.00%)	⬇️
...src/github.com/pingcap/tiup/pkg/environment/env.go	37.76% <0.00%> (-0.41%)	⬇️
...om/pingcap/tiup/pkg/cluster/operation/operation.go	72.72% <0.00%> (ø)
...m/pingcap/tiup/components/cluster/command/clean.go	86.66% <0.00%> (ø)
...om/pingcap/tiup/components/cluster/command/root.go	45.56% <0.00%> (+0.32%)	⬆️
...pingcap/tiup/components/cluster/command/destroy.go	69.56% <0.00%> (+1.38%)	⬆️
...c/github.com/pingcap/tiup/pkg/cluster/api/dmapi.go	62.77% <0.00%> (+1.45%)	⬆️
...om/pingcap/tiup/components/cluster/command/test.go	64.06% <0.00%> (+1.84%)	⬆️
....com/pingcap/tiup/pkg/cluster/operation/destroy.go	59.13% <0.00%> (+4.64%)	⬆️
...ithub.com/pingcap/tiup/pkg/cluster/module/shell.go	76.92% <0.00%> (+23.07%)	⬆️

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[ti-srebot]

/run-all-tests

[lonng]

This PR introduces some dangerous operation for the cluster, it's better to add some integration tests.

[lonng]

LGTM
Don't forget to update the documentation.

[lonng]

@lucklove Please write the release note for this PR.