improve IAM module

Signed-off-by: hongming <talonwan@yunify.com>

vendor/go.etcd.io/etcd/raft/quorum/voteresult_string.go

@@ -0,0 +1,26 @@
+// Code generated by "stringer -type=VoteResult"; DO NOT EDIT.
+
+package quorum
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[VotePending-1]
+	_ = x[VoteLost-2]
+	_ = x[VoteWon-3]
+}
+
+const _VoteResult_name = "VotePendingVoteLostVoteWon"
+
+var _VoteResult_index = [...]uint8{0, 11, 19, 26}
+
+func (i VoteResult) String() string {
+	i -= 1
+	if i >= VoteResult(len(_VoteResult_index)-1) {
+		return "VoteResult(" + strconv.FormatInt(int64(i+1), 10) + ")"
+	}
+	return _VoteResult_name[_VoteResult_index[i]:_VoteResult_index[i+1]]
+}