collector: ping InfluxDB and create database at startup
collector: ping InfluxDB and create database at startup

Ping InfluxDB to verify the connection at collector initialization and
create the database.

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