Error initializing storage of type postgresql for PostgreSQL 10.2

[vitya-ne]

Vault initialization have an error after upgrade Postgresql to 10.2

This place in postgresql.go now wrong:

var upsert_required bool
upsert_required_query := "SELECT string_to_array(setting, '.')::int[] < '{9,5}' FROM pg_settings WHERE name = 'server_version'"

on PostgreSQL 10.1:

SELECT string_to_array(setting, '.') FROM pg_settings WHERE name = 'server_version';
 string_to_array 
-----------------
 {10,1}

on PostgreSQL 10.2:

SELECT string_to_array(setting, '.') FROM pg_settings WHERE name = 'server_version';
          string_to_array          
-----------------------------------
 {10,"2 (Debian 10",2-1,pgdg90+1)}

• Vault Version: 0.9.3
• Operating System/Architecture: Debian 9.3

Startup Log Output:
Error initializing storage of type postgresql: failed to check for native upsert: pq: неверное значение для целого числа: "2 (Debian 10"

[jefferai]

It's unclear whether this is something Debian-specific or not; regardless this is a community supported backend so definitely the fastest way to get this resolved would be to put in a PR.

[vitya-ne]

@jefferai, thanks!
issue resolved in version 0.9.4.