to set local_ip in osh, you have to use nic name.
but some devices can have different nic name.
so I add new option for getting tunnel device by cidr.
Added value:
network:
interface:
tunnel: null
tunnel_network_cidr: "0/0"
Change-Id: I8bffae640dfe0086de0b5274bb8c3cdce9754160
Signed-off-by: Hyunkook Cho <hk0713.cho@samsung.com>