Move netdomain policy to private

This leaves only the existence of netdomain attribute as public API.
All other rules are implementation details of this attribute's policy
and are thus now private.

Test: No change to policy according to sesearch, except for
      disappearance of all allow rules to do with netdomain_current
      and *_current attributes targeted when netdomain rules reference
      public types.
Bug: 31364497
Change-Id: I102e649374681ce1dd9e1e5ccbaaa5cb754e00a0

private/net.te

+###
+### Domain with network access
+###
+
+# Use network sockets.
+allow netdomain self:tcp_socket create_stream_socket_perms;
+allow netdomain self:{ udp_socket rawip_socket } create_socket_perms;
+# Connect to ports.
+allow netdomain port_type:tcp_socket name_connect;
+# Bind to ports.
+allow {netdomain -ephemeral_app} node_type:{ tcp_socket udp_socket } node_bind;
+allow {netdomain -ephemeral_app} port_type:udp_socket name_bind;
+allow {netdomain -ephemeral_app} port_type:tcp_socket name_bind;
+# See changes to the routing table.
+allow netdomain self:netlink_route_socket { create read getattr write setattr lock append bind connect getopt setopt shutdown nlmsg_read };
+
+# Talks to netd via dnsproxyd socket.
+unix_socket_connect(netdomain, dnsproxyd, netd)
+
+# Talks to netd via fwmarkd socket.
+unix_socket_connect(netdomain, fwmarkd, netd)
+
+# Connect to mdnsd via mdnsd socket.
+unix_socket_connect(netdomain, mdnsd, mdnsd)

public/net.te

@@ -2,24 +2,3 @@
 type node, node_type;
 type netif, netif_type;
 type port, port_type;
-
-# Use network sockets.
-allow netdomain self:tcp_socket create_stream_socket_perms;
-allow netdomain self:{ udp_socket rawip_socket } create_socket_perms;
-# Connect to ports.
-allow netdomain port_type:tcp_socket name_connect;
-# Bind to ports.
-allow {netdomain -ephemeral_app} node_type:{ tcp_socket udp_socket } node_bind;
-allow {netdomain -ephemeral_app} port_type:udp_socket name_bind;
-allow {netdomain -ephemeral_app} port_type:tcp_socket name_bind;
-# See changes to the routing table.
-allow netdomain self:netlink_route_socket { create read getattr write setattr lock append bind connect getopt setopt shutdown nlmsg_read };
-
-# Talks to netd via dnsproxyd socket.
-unix_socket_connect(netdomain, dnsproxyd, netd)
-
-# Talks to netd via fwmarkd socket.
-unix_socket_connect(netdomain, fwmarkd, netd)
-
-# Connect to mdnsd via mdnsd socket.
-unix_socket_connect(netdomain, mdnsd, mdnsd)