ovirt.te: iptables add user_tmpfs_t:file

This patch adds:
 - user_tmpfs_t:file { read open getattr };

Allows iptables start with ovirt-hosted-engine-setup.

Change-Id: Ia18df6785cdee385e1eaf930cca45132a4cfabf7
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>