fix config error in cluster_basic_test

[qinyihust]

What problem does this PR solve?

in cluster_basic_test
mds start error on InitEtcdClient(), and produced coredump

Problem Summary:
log:
{"level":"warn","ts":"2020-12-29T11:17:52.264+0800","caller":"clientv3/retry_interceptor.go:61","msg":"retrying of unary invoker failed","target":"endpoint://client-e074fa9d-964b-4feb-ad0f-23a198366627/127.0.0.1:2301","attempt":0,"error":"rpc error: code = Canceled desc = context canceled"}
2020-12-29 11:17:52.264637 I | session of current mds(127.0.0.1:2310) occur error
E 2020-12-29T11:17:52.264657+0800 1779304 leader_election.cpp:79] 127.0.0.1:2310 leader observe for prefix:07leader occur error, errcode: 23
I 2020-12-29T11:17:52.264678+0800 1779304 leader_election.cpp:86] mds is existing due to the error of leader observation
I 2020-12-29T11:17:52.264693+0800 1779256 heartbeat_manager.cpp:88] heartbeatManager not running.
I 2020-12-29T11:17:52.319905+0800 1771645 cluster.cpp:787] probe 127.0.0.1:2310 fail.
I 2020-12-29T11:17:54.320030+0800 1771645 cluster.cpp:161] stop mds 127.0.0.1:2310 success
I 2020-12-29T11:17:54.320063+0800 1771645 cluster.cpp:148] stop mds 127.0.0.1:2311 begin...
I 2020-12-29T11:17:54.323937+0800 1771645 cluster.cpp:787] probe 127.0.0.1:2311 fail.
2020-12-29 11:17:55.255706 I | etcd do NewCient get err:context deadline exceeded, errCode:DeadlineExceeded
F 2020-12-29T11:17:55.255734+0800 1780290 mds.cpp:234] init etcd client err! etcdaddr: 127.0.0.1:2379int, etcdaddr len: 14, etcdtimeout: 5000, operation timeout: 5000, etcd retrytimes: 3
*** Check failure stack trace: ***
*** Aborted at 1609211875 (unix time) try "date -d @1609211875" if you are using GNU date ***
PC: @ 0x0 (unknown)
*** SIGABRT (@0x1b2a42) received by PID 1780290 (TID 0x7f5d501c8a00) from PID 1780290; stack trace: ***
@ 0x7f5d4e9720e0 (unknown)
@ 0x7f5d4d062fff gsignal
@ 0x7f5d4d06442a abort
@ 0x55aa10d27f56 google::FlushAndAbort()
@ 0x55aa10d21aa8 google::LogMessage::Fail()
@ 0x55aa10d21962 google::LogMessage::SendToLog()
@ 0x55aa10d20deb google::LogMessage::Flush()
@ 0x55aa10d270da google::LogMessageFatal::~LogMessageFatal()
@ 0x55aa0fe7c615 curve::mds::MDS::InitEtcdClient()
@ 0x55aa0fe79923 curve::mds::MDS::StartCompaginLeader()
@ 0x55aa0fe71a2b main

What's Changed:

How it Works:

Side effects(Breaking backward compatibility? Performance regression?):

Check List

• Relevant documentation/comments is changed or added
• I acknowledge that all my contributions will be made under the project's license