Require comments to be resolved before submission

Bug: b/5775236
Change-Id: I7b38e64a0e79555a0e6fc6417d78174466cec8bb
Reviewed-on: https://boringssl-review.googlesource.com/c/All-Projects/+/73047
Reviewed-by: David Benjamin <davidben@google.com>

project.config

diff --git a/project.config b/project.config
index a59f2c9..ba20edc 100644
--- a/project.config
+++ b/project.config
@@ -139,3 +139,8 @@
 	submittableIf = label:Code-Review=MAX,user=non_uploader AND -label:Code-Review=MIN
 	overrideIf = label:Bot-Commit=+1 AND -label:Code-Review=MIN
 	canOverrideInChildProjects = true
+[submit-requirement "No-Unresolved-Comments"]
+	description = Changes that have unresolved comments are not submittable. Unless overridden with "Unresolved-Comment-Reason: <reason>" line in change message.
+	overrideIf = message:\"^.*Unresolved-Comment-Reason:.*\"
+	applicableIf = has:unresolved
+	submittableIf = -has:unresolved