RFE: test audit signal and ptrace functionality

[rgbriggs]

Add a test to verify basic functionality of the ptrace and signal of the audit daemon.

When ptrace is run on a task, verify an AUDIT_OBJ_PID record is recorded on syscall exit of the ptrace task.

When a signal (TERM|HUP|USR1|USR2) is delivered to the audit daemon, test that a request for AUDIT_SIGNAL_INFO is correctly returned.

When signal logging is configured in audit, verify all signals delivered to a task are recorded on syscall exit of that target task.