When piped logs are opened during parsing of configuration
it results in unexpected situations in apache httpd
and can cause hang of process which is trying to log
into auditlog.
Code should work as before, with the exception of
one additional condition evaluation when primary
audit log is not set and secondary audit log
path to piped executable is now not relative
to server root.
Remove compile-time setting for generating audit logs
as JSON, creating a new config option (SecAuditLogFormat).
sec_audit_logger is now a wrapper for sec_audit_logger_json
or sec_audit_logger_native. This has the disadvantage of
making the audit log generation code harder to maintain,
but the logger function itself now is no longer pepper
with binary branches.
