syslogd: Clean up allowedpeer structure

[jfree]

Summary

• Use boolean values in validate() and struct allowedpeer.
• Remove useless peer count loop.

[markj]

usr.sbin/syslogd/syslogd.c

204

By the way, we now use anonymous unions in quite a few places, so you could instead write

union {
    struct {
        struct sockaddr_storage a_addr;
        ...
};

and get rid of those horrible defines. But that should be done in a separate diff if at all.

[jfree]

Update after rebase