Change default verdict values for code review and verified.

As of now, there are some gerrit defined values of verdict type.

* Code Review : "CRVW"
* Verified: "VRIF"

Since Gerrit2.6, those are updated.

* Code Review: "Code-Review"
* Verified: "Verified"

This change follows the latest values. If the old ones are provided to VerdictCategory,
those are normalized to the latest ones.

This change could solve the issue like "Commend added event from Gerrit 2.6 cannot trigger any jobs".