fix: Fix job label

[minshenglin]

What this PR does / why we need it:

the hyphen in job name label has been changed to use underscore, so pods will never be found.

Which issue(s) this PR is related to (optional, link to 3rd issue(s)):

Fixes #79

Special notes for your reviewer:

/cc @your-reviewer

Release note:

NONE

[caicloud-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gaocegege

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[coveralls]

Pull Request Test Coverage Report for Build 71

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 87.5%

---

Totals
Change from base Build 70:	0.0%
Covered Lines:	357
Relevant Lines:	408

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 71

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 87.5%

---

Totals
Change from base Build 70:	0.0%
Covered Lines:	357
Relevant Lines:	408

---

💛 - Coveralls

[gaocegege]

/release-note-none

[gaocegege]

@minshenglin

Thanks for your contribution! :tada: :+1: