Zabbix

...G...... [ZBXNEXT-3910] Added 'disk' and 'trace' process track for OpenBSD

Introduce two new defines for two more types of monitored processes. in
sysinfo.h. They will be used for also the other future commits.

Handle processes that are in an uninterruptible sleep (D) and in a stopped state(T).
We still keep the series of ifdef for older versions of the OS after the KVM
subsystem was moved to the new kern_proc structure.
It should be removed in one of the next releases, being nearly 5 years that it was
introduced (consider that OpenBSD support a release for only one year).