Merge pull request #20875 from jan--f/mgr-server-list-hostname

mgr: add mgr daemon to DaemonStateIndex with metadata (hostname)

Reviewed-by: John Spray <john.spray@redhat.com>

diff --cc src/mgr/DaemonServer.cc
Simple merge

diff --cc src/mgr/Mgr.cc
Simple merge

diff --cc src/mgr/Mgr.h
Simple merge