Issue 51136 - JSON Error output has redundant messages
Bug Description: When we try to start an instance for which
'systemctl start' command has failed, it produces excessive
output which is not a clear JSON.
Fix Description: Redirect stderr to stdout as we don't need
the info in CLI. User needs to check logs if something went wrong.
Add a new-line character in the end of DS CLI tool's stderr.
Clean up React state processing for setServerID callback.
https://pagure.io/389-ds-base/issue/51136
Reviewed by: mreynolds (Thanks!)