Fix compatibility with some Postgres versions (#3986)
Fix compatibility with some Postgres versions (#3986)

use server_version_num instead of parsing the text version. See: https://www.postgresql.org/docs/10/static/functions-info.html
hashicorp/vault,quixoten/vault,Aloomaio/vault,hartsock/vault,hashicorp/vault,naunga/vault,joelthompson/vault,kingland/vault,hartsock/vault,quixoten/vault,mgk/vault,hashicorp/vault,Aloomaio/vault,joelthompson/vault,Aloomaio/vault,quixoten/vault,rnaveiras/vault,hashicorp/vault,kingland/vault,quixoten/vault,joelthompson/vault,naunga/vault,hashicorp/vault,Aloomaio/vault,mgk/vault,rnaveiras/vault,kingland/vault,kingland/vault,kingland/vault,mgk/vault,hartsock/vault,joelthompson/vault,hashicorp/vault,rnaveiras/vault,mgk/vault,rnaveiras/vault,hartsock/vault,rnaveiras/vault,hartsock/vault