This revision introduces test program for !!System V!! standardized system calls concerned
with creating and manipulating message queues. These system calls are categorized within
//inter-process-communication// audit class (as expected).
System calls in question are:
* msgget(2)
* msgsnd(2)
* msgrcv(2)
* msgctl(2)
**Note**:
`msgctl(2)` takes as argument a `cmd` which is a separate audit event in itself.
List of msgctl(2) audit events:
* AUE_MSGCTL_STAT
* AUE_MSGCTL_RMID
* AUE_MSGCTL_SET
For full details, please see: [sys/security/audit/audit_bsm_klib.c#L248](https://github.com/freebsd/freebsd/blob/master/sys/security/audit/audit_bsm_klib.c#L248)
Each of them have been treated as separate audit events. (And hence, separate tests)