cmd/coordinator: skip the vet/all test

Change-Id: If2e03e16527753f271f9fa7431622d26d079e3f3
Reviewed-on: https://go-review.googlesource.com/37575
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

cmd/coordinator/coordinator.go

@@ -2020,6 +2020,9 @@ func (st *buildStatus) shouldSkipTest(testName string) bool {
 		}
 	}
 	switch testName {
+	case "vet/all":
+		// Old vetall test name, before the sharding in CL 37572.
+		return true
 	case "api":
 		return st.isTry() && st.name != "linux-amd64"
 	}