[tempo-distributed] Static ports

[xogoodnow]

Hi,

None of the service/port related configurations for gateway were actually dynamic.
Also changed the probe so the parameters could be configured

Cheers

[xogoodnow]

I see that almost all other services (except for metrics-generator) are static.
Will change the templates

[xogoodnow]

I went through almost all services and mildly modified the templates so the ports could be modified dynamically.

1. If the ports section are there so folks would be able to change the ports, they must not be set statically but if the section is just informative, we can commit them all and just provide a link to the documentation.
2. This way changing any default port would be possible in the future

Cheers