Remove metadata check before adding static route for openstack datasource

[rayy3535]

Since most recent windows versions do not have static route to openstack/ec2 mds ip, e.g., 169.254.169.254, please consider to remove mds url check before static route is added. Otherwise those checks will prolong mds discovery for 1~2 minutes. Or at lease disable this behavior for openstack/ec2 datasources

related code, util/network.py:

//if (not osutils.check_static_route_exists(metadata_host) and not check_url(metadata_url)):