bgp: fix conflict of PEER_NEXT_HOP and NEXT_HOP value
bgp: fix conflict of PEER_NEXT_HOP and NEXT_HOP value

The third is fix to a conflict of PEER_NEXT_HOP value in neighbors.py.

There is a conflict between PEER_NEXT_HOP in neighbors.py and NEXT_HOP in api/base.py.
As a result of the conflict, the correct validator for PEER_NEXT_HOP is not used when
neighbir_add is executed.

Signed-off-by: Hiroshi Yokoi <e59dd578f413d3787f7f28c9bb6236efb1779349@po.ntts.co.jp>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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