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.

JENKINS-18457 and JENKINS-18805 can be fixed by this change.