Read a commit as the same as itself however short, and fit the pending assignments' tests to a mesh that asks no build (issue 1851, A9, A10)

cmd/mesh-controller/plan_keys.go

@@ -209,6 +209,9 @@ func sameCommitID(a, b string) bool {
 	if a == "" || b == "" {
 		return false
 	}
+	if a == b {
+		return true
+	}
 	n := min(len(a), len(b))
 	return n >= 7 && a[:n] == b[:n]
 }