server: create PeerInfo

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
table: move AdjRib out of TableManager

No one-to-one relationship between AdjRib and localRib so move AdjRib
out of TableManager.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>