zebra: fix 'directly-connected' type configuration from grpc api
zebra: fix 'directly-connected' type configuration from grpc api

Works but sorta hacky. We should revise after the GRPC API udpate.

Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

j-kato/gobgp,tamihiro/gobgp,osrg/gobgp,tamihiro/gobgp,a16/gobgp,tamihiro/gobgp,osrg/gobgp,tamihiro/gobgp,a16/gobgp,j-kato/gobgp,a16/gobgp,a16/gobgp,j-kato/gobgp,fujita/gobgp,a16/gobgp,a16/gobgp,a16/gobgp,osrg/gobgp,osrg/gobgp,fujita/gobgp,fujita/gobgp,fujita/gobgp