ovirt.te: add sanlock nfs avc

This patch adds:
  allow sanlock_t nfs_t:dir search;
  allow sanlock_t nfs_t:file open;

Change-Id: I1f24af8c501626de6c59f5d31f8ca9c93b9671bd
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>