Fix postgreSQL version

[sergkudinov]

When starting a new cluster:

jumbo (mycluster) > start

There is an error:

TASK [postgres : Download version 10] ******************************************
fatal: [master01]: FAILED! => {"changed": false, "msg": "Failure downloading https://download.postgresql.org/pub/repos/yum/10/redhat/rhel-7-x86_64/pgdg-centos10-10-2.noarch.rpm, HTTP Error 404: Not Found"}

This commit fixes the downloading source.

[Nuttymoon]

Is seems like the url is also broken for version 9.5 and 9.6 and that the new one is the same. Could you please also include the fix for those? Thanks!

[sergkudinov]

Done https://www.postgresql.org/download/linux/redhat/