IPv6 Link Local address handling

[mkowalczyk88]

I was trying to use AwaLWM2M between Ci40 and 6lowpan clicker.
I saw following issues:

1. Even if I explicitly set local ip address on a command line argument of awa_serverd (example: awa_serverd --interface lowpan0 --addressFamily 6 --port 5683 --ip=fe80::c892:fd83:e6b7:c392 -v -o temp_object.xml) it still wants to bind to the Global Scope address (for example to 2001:1418:100::1/48). It should bind to the address I passed as an argument. See "Lwm2mCore_GetIPAddressFromInterface": there is the if-else statement checking firstly "globalIpv6Address" and then does not care about link local at all.
2. When I forced it to bind to the local link address (by hardcoding it in code) I encoutered new problems. The link local address is kept together with iface name "fe80::c892:fd83:e6b7:c392%lowpan0". Normally this is not a problem, but in function "NetworkAddress_FromIPAddress" there is a call to "inet_pton" which does NOT accept "%iface" format.
3. When I forced inet_pton to succeed (by hardcoding address without "%iface" in code) it came out that call to "bind" in NetworkSocket_StartListening fails because of "invalid argument". This is because for link local IPv6 addresses, the "sin6_scope_id" should be set.
4. When I forced sin6_scope_id to be set (by hardcoding result->Address.Sin6.sin6_scope_id = if_nametoindex("lowpan0") inside "NetworkAddress_FromIPAddress") I finally could see my AwaLWM2M client. The UDP packets were exchanged so I saw my client on a list (awa-server-list-clients). Unfortunetly, when I tried to read my resource I got segmentation fault on a server side. I didn't debug it further.

[datachi7d]

This appears to be a bug with our network abstraction layer. We need to investigate this.