Disable the "can one of the admins verify this patch" comment of zettabot

[prakashsurya]

For each pull request not submitted by a user of the openzfs organization, zettabot will post a comment that asks: "can one of the admins verify this patch?". This is unnecessary and should be removed.

[witmax]

Under GitHub Pull Request Builder, click Advance button, other follow either one of below

1. input the GitHub organization in field "List of organizations. Their members will be whitelisted.", Check "Allow members of whitelisted organizations as admins"
2. Check "Build every pull request automatically without asking (Dangerous!)."
   Then done.