Update nether.rules for multicast IP

Update nether.rules for multicast IP

Loopback communication should be allowed only for multicast address range.
In case, iptable will set packet's secmark to 'System' label to avoid
Smack deny issue.

Current -r option is for ipv4. ip6table will be updated on ExecStartPost.

* IPv4
 - '224.0.1.187', IPv4 multicast address for "All CoAP Nodes"
* IPv6
 - 'ff02::', IPv6 multicast address for "All CoAP Nodes", link-local scope
 - 'fe80::ae5a:14ff:fe0e:b2c0', This is only for iotcon provisioning, but
   should be removed.

Change-Id: Ic57d2205f8bb20ece23de4fe48db9d2cbad43ea8
Signed-off-by: jooseong lee <jooseong.lee@samsung.com>