Allow latest version of the PostgreSQL module

[teluq-pbrideau]

Pull Request (PR) description

Update postgresql module dependency to < 9

[teluq-pbrideau]

I don’t think the postgresql module version makes the server.sql file unavailable...

  Notice: /Stage[main]/Zabbix::Database::Postgresql/Exec[zabbix_server_create.sql]/returns: psql: error: server.sql: No such file or directory
  Error: 'cd /usr/share/doc/zabbix-sql-scripts/postgresql/ && if [ -f server.sql.gz ]; then gunzip -f server.sql.gz ; fi && psql -h 'localhost' -U 'zabbix_server' -d 'zabbix_server' -f server.sql && touch /etc/zabbix/.schema.done' returned 1 instead of one of [0]
  Error: /Stage[main]/Zabbix::Database::Postgresql/Exec[zabbix_server_create.sql]/returns: change from 'notrun' to ['0'] failed: 'cd /usr/share/doc/zabbix-sql-scripts/postgresql/ && if [ -f server.sql.gz ]; then gunzip -f server.sql.gz ; fi && psql -h 'localhost' -U 'zabbix_server' -d 'zabbix_server' -f server.sql && touch /etc/zabbix/.schema.done' returned 1 instead of one of [0]

This should probably be fixed elsewhere

edit to add: is probably the issue #838

[smortex]

Just to be sure, can you rebase on top of master to confirm that integration tests pass?