jaeger - add service name prefix

[Sahid Orentino]

In some deployments where more than one region gets involved we could be in a situation where operators want to make difference between services running on separated regions.

The proposed change to resolve such use-case will be to add a prefix for the current well auto-generated service name.

For that it is proposed to introduce an option especially for Jaeger.

```
[jaeger]
Service_name_prefix =
```

At this opposite of the current behavior `<project>-<service>` An operator setting it will be able for example to separate service name per region using a prefix like `region1-nova-api`

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/osprofiler/+/872152

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/osprofiler/+/872152
Committed: https://opendev.org/openstack/osprofiler/commit/b7468756bcfdf3fe74e7cacb0562a7f969472250
Submitter: "Zuul (22348)"
Branch: master

commit b7468756bcfdf3fe74e7cacb0562a7f969472250
Author: Sahid Orentino Ferdjaoui <email address hidden>
Date: Mon Jan 30 11:53:18 2023 +0100

    jaeger: introduce service name prefix

    Closes-bug: #2003092
    Signed-off-by: Sahid Orentino Ferdjaoui <email address hidden>
    Change-Id: I743fdc1203af6735d5772728e1b5c2ca16d41d9e

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/osprofiler 4.0.0 release.