[BUG] OSSEC ID keep growing up

[nhatking16591]

Currently, I use ossec-authd to register a new agent and manage_agents to remove a agent . I face to an issue that the agent ID keep growing up( even some agent have been removed from ossec server) and some days it will reach to the limit (ID=MAX_AGENTS + AUTHD_FIRST_ID) I can't register new agent anymore.
https://github.com/ossec/ossec-hids/blob/master/src/addagent/validate.c#L49

I have increased MAX_AGENTS and recompiled it. But it is just a workaround and in the future i will see that issue again.

Can we have any better solution to reuse ID or any workaround for it?

Thanks.
King

[nhatking16591]

PR for this issue at: #1594

[nhatking16591]

Thanks for merging PR: #1594