added parameter for rib_get

this parameter will support to display like cli as follows.

    Status codes: * valid, > best
         Network                          Next Hop             Reason          Metric LocPrf Path
     *>  10.20.2.0/24                     0.0.0.0              Only Path                     i
     *>  10.20.3.0/24                     0.0.0.0              Only Path                     i
     *>  10.20.1.0/24                     0.0.0.0              Only Path                     i

Signed-off-by: Toshiki Tsuboi <t.tsubo2000@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
added parameter for vrfs_get (in case of format = 'cli')

this parameter will support to display like cli as follows.

    Status codes: * valid, > best
         Network                          Next Hop             Reason          Metric LocPrf Path
    VPN: ('64511:101', 'ipv4')
     *>  10.20.2.0/24                     0.0.0.0              Only Path                     2
     *>  10.20.1.0/24                     0.0.0.0              Only Path                     2
     *>  10.20.3.0/24                     0.0.0.0              Only Path                     2

Signed-off-by: Toshiki Tsuboi <t.tsubo2000@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>