DO NOT MERGE: partial backport of 08461cb0

Original change: Allow netd-spawned domains to use inherited netd unix_dgram_socket.

Resolves denials such as:
 avc:  denied  { read write } for  pid=4346 comm="hostapd" path="socket:[7874]" dev="sockfs" ino=7874 scontext=u:r:hostapd:s0 tcontext=u:r:netd:s0 tclass=unix_dgram_socket
 avc:  denied  { read write } for  pid=4348 comm="dnsmasq" path="socket:[7874]" dev="sockfs" ino=7874 scontext=u:r:dnsmasq:s0 tcontext=u:r:netd:s0 tclass=unix_dgram_socket

Change-Id: Iebbbf8f9f31b56ec5b158dda93101472c25e638d
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

hostapd.te

@@ -15,8 +15,10 @@ allow hostapd wifi_data_file:sock_file { create setattr write unlink };
 
 allow hostapd netd:fd use;
 allow hostapd netd:udp_socket { read write };
+allow hostapd netd:fifo_file { read write };
+# TODO: Investigate whether these inherited sockets should be closed on exec.
 allow hostapd netd:netlink_kobject_uevent_socket { read write };
 allow hostapd netd:netlink_nflog_socket { read write };
 allow hostapd netd:netlink_route_socket { read write };
 allow hostapd netd:unix_stream_socket { read write };
-allow hostapd netd:fifo_file { read write };
+allow hostapd netd:unix_dgram_socket { read write };