RFR: 1215: Clean label not updating correctly [v2]

[Zhao Song]

> Originally, If the user mistakenly creates a Backport PR with the wrong hash and then later corrects it, the clean status is never correctly re-evaluated. 
> 
> Currently, If the user correct the hash, the bot will be forced to do the check again and could correctly add clean label.

Zhao Song has updated the pull request incrementally with one additional commit since the last revision:

  Updated regexp metadataComments

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Changes:
  - all: https://git.openjdk.org/skara/pull/1388/files
  - new: https://git.openjdk.org/skara/pull/1388/files/93080819..c32273c8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1388&range=01
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1388&range=00-01

  Stats: 11 lines in 1 file changed: 0 ins; 8 del; 3 mod
  Patch: https://git.openjdk.org/skara/pull/1388.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1388/head:pull/1388

PR: https://git.openjdk.org/skara/pull/1388