ovirt.te: add sysstat_t type

This patch adds:
    allow sysstat_t auditd_log_t:dir write;
    allow sysstat_t auditd_log_t:file getattr;

Change-Id: I4e5304b178b819da9baf4b6cf6fd7cc333421c7d
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>