Upstream github.com/zabbix/zabbix-docker/issues/1643 is now fixed.
This previously prevented us from using both HashiCorp Vault and the
default docker-entrypoint.sh file that came with the the
zabbix/zabbix-server-pgsql:alpine-7.2-latest image.
Upstreams commit hash 435e92f made it so that when Vault params are
present both the Zabbix server config params DBUser and DBPassword
are unset.
