proto: update proto name and remove conflictPolicy

[lichunzhu]

What problem does this PR solve?

New prometheus insist that proto files should have different names, so #1083 introduces ldflags LDFLAGS += -X "google.golang.org/protobuf/reflect/protoregistry.conflictPolicy=warn" for drainer to avoid panic.

What is changed and how it works?

Solve the protocol buffer namespace conflict problem. Similar to pingcap/tidb-tools#541

Check List

Tests

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

Release note

• No release note

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• 3pointer
• glorv

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[sre-bot]

No release note, Please follow https://github.com/pingcap/community/blob/master/contributors/release-note-checker.md

[lichunzhu]

/rebuild

[lichunzhu]

/run-all-tests

[lichunzhu]

/run-all-tests

[rleungx]

LGTM

[ti-chi-bot]

@rleungx: Thanks for your review. The bot only counts approvals from reviewers and higher roles in list, but you're still welcome to leave your comments.

In response to this:

LGTM

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[lichunzhu]

/merge

[ti-chi-bot]

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

Commit hash: 804eb54

[lichunzhu]

/rebuild