ovn: fix corrupted database file on start

[zhangzujian]

• Make sure you have followed Kube-OVN Code Style.

What type of this PR

Examples of user facing changes:

• Features
• Bug fixes
• Docs
• Tests

Which issue(s) this PR fixes:

Fixes #(issue-number)

root@kube-ovn-control-plane:~# ovsdb-tool check-cluster ovnnb_db.db
ovsdb-tool: syntax error: ovnnb_db.db: parse error at offset 65335 in header line ""
root@kube-ovn-control-plane:~# stat -c %s ovnnb_db.db
65419
root@kube-ovn-control-plane:~#
root@kube-ovn-control-plane:~# ovsdb-tool fix-cluster ovnnb_db.db
ovsdb-tool: syntax error: ovnnb_db.db: parse error at offset 65335 in header line ""
root@kube-ovn-control-plane:~# stat -c %s ovnnb_db.db
65335
root@kube-ovn-control-plane:~# ovsdb-tool check-cluster ovnnb_db.db
root@kube-ovn-control-plane:~#

WHAT

copilot:summary

copilot:poem

HOW

copilot:walkthrough