[Bug] Error occurred when gpintsystem using auto failover for coordinator feature

### Cloudberry Database version

1.6.0

### What happened

Error occurred when gpintsystem using auto failover for coordinator feature ,After configure with --enable-external-fts and etcd cluster also be installed; The command I'm used is 'gpinitsystem -c gpinitsystem_config -h hosts -s gp140 -p /data/cloudberrydb/cbdb_etcd.conf -F /data/cloudberrydb/fts_service.conf -U 1'
More detail errors see as below pitcures.

### What you think should happen instead

_No response_

### How to reproduce

https://www.linen.dev/s/cloudberrydb/t/22304006/hi-i-have-learned-that-there-is-an-auto-failover-for-coordin#23604d14-b41f-48a2-8b4e-92eae01b45cd [External fts setup.pdf](https://static.main.linendev.com/attachments/c4f2894c-a7e5-4493-88d1-4848dd29f607/ef72834f-0ab9-45df-80c1-9ef3dd561fbaexternal-fts-setup.pdf)
The document on website is not detailed enough .

### Operating System

openEuler 22.03 (LTS-SP4)

### Anything else

_No response_

### Are you willing to submit PR?

- [X] Yes, I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://cloudberrydb.org/community/coc).