scenario_test: refactor route_server_policy_test
scenario_test: refactor route_server_policy_test

Currently, it's not easy to add or delete a test because it's
necessary to specify a number for each test by hand. Instead, let's
assign a number for each test automatically.

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

a16/gobgp,Dipsingh/gobgp,h-naoto/gobgp,a16/gobgp,tamihiro/gobgp,a16/gobgp,tamihiro/gobgp,ramrunner/gobgp,ramrunner/gobgp,osrg/gobgp,fujita/gobgp,YujiOshima/gobgp,Dipsingh/gobgp,j-kato/gobgp,ishidawataru/gobgp,j-kato/gobgp,osrg/gobgp,tamihiro/gobgp,fujita/gobgp,h-naoto/gobgp,fujita/gobgp,fujita/gobgp,h-naoto/gobgp,a16/gobgp,Dipsingh/gobgp,a16/gobgp,osrg/gobgp,YujiOshima/gobgp,YujiOshima/gobgp,a16/gobgp,ramrunner/gobgp,osrg/gobgp,tamihiro/gobgp,ishidawataru/gobgp,j-kato/gobgp,ishidawataru/gobgp,a16/gobgp