Merge pull request #1 from tigeli/ipv6plugin

[connman] set network index for ipv6 and do not set ip-address from ofono if there is none
[connman] ofono plugin: do not reset index to -1

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
Merge pull request #31 from jpoutiai/cellular_IPV6

Cellular ipv6