fix igp router id parse error

[meidli]

No description provided.

[coveralls]

Coverage increased (+0.002%) to 61.187% when pulling df76881 on meidli:master into c5d2294 on smartbgp:master.

[coveralls]

Coverage remained the same at ?% when pulling 3bc7a92 on meidli:master into c5d2294 on smartbgp:master.

[xiaopeng163]

OSPFv2, OSPFv3 non-pseudonode

return_data['igp_router_id'] = {
    "router_id": "3.3.3.3",
    "pseudonode": False
}

OSPFv2, OSPFv3, LAN pseudonode

{
    "router_id": "3.3.3.3",
    "pseudonode": True,
    "designated_router_addr": "100.100.100.3"
}

IS-IS LAN pseudonode = ISO Node-ID + PSN

 return_data['igp_router_id'] = {
    "iso_node_id": "0000.0000.0001",
    "psn": 1,
    "pseudonode": True
}

# IS-IS non-pseudonode

{
    "iso_node_id": "0000.0000.0001",
    "pseudonode": False
}