Clean up socket rules.

Replace * or any permission set containing create with
create_socket_perms or create_stream_socket_perms.

Add net_domain() to all domains using network sockets and
delete rules already covered by domain.te or net.te.

For netlink_route_socket, only nlmsg_write needs to be separately
granted to specific domains that are permitted to modify the routing
table.   Clarification:  read/write permissions are just ability to
perform read/recv() or write/send() on the socket, whereas nlmsg_read/
nlmsg_write permissions control ability to observe or modify the
underlying kernel state accessed via the socket.
See security/selinux/nlmsgtab.c in the kernel for the mapping of
netlink message types to nlmsg_read or nlmsg_write.

Delete legacy rule for b/12061011.

This change does not touch any rules where only read/write were allowed
to a socket created by another domain (inherited across exec or
received across socket or binder IPC).  We may wish to rewrite some or all
of those rules with the rw_socket_perms macro but that is a separate
change.

Change-Id: Ib0637ab86f6d388043eff928e5d96beb02e5450e
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>