* Fix misleading log msg on shutdown
gRPCServer.GracefulStop blocks until it has been shutdown. Logging
"Initiated graceful stop" after it has been completed is misleading.
Names are added to the message to discern services. Also, a minimum test
is added mainly to verify the change made with this commit.
* Add changelog fragment file
* Capitalize log messages
* Update endtoend test for fixed log messages
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Co-authored-by: Radosław Kapka <rkapka@wp.pl>