Input address format mistake when get grpc client connection

[ZuLiangWang]

Describe this problem
CeresMeta node need to create grpc client in the following two scenarios:

• Forward request to CeresMeta leader node, the leader node address is http format like http://127.0.0.1:22380.
• Dispatch event to CeresDB node, CeresDB node address is endpoint with port like 127.0.0.1:2379.

But CeresMeta current only support the second scenario, when forward request to leader node, the following error occurs:
ERRO [cluster/src/cluster_impl.rs:80] Send heartbeat to meta failed, err:Failed to send heartbeat, cluster:defaultCluster, err:status: Unavailable, message: "connection error: desc = \"transport: Error while dialing dial tcp: address http://127.0.0.1:22379: too many colons in address\"", details: [], metadata: MetadataMap { headers: {"content-type": "application/grpc"} }

Steps to reproduce

1. Start CeresMeta and CeresDB in cluster mode.
2. Close CeresMeta leader node.

Expected behavior
CeresMeta node can create grpc client in both cases.

Additional Information