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Instead of generically any segment that is not local.

Rename readers_subscribed_ to readers_group_subscribed_.

Pass the sgmtinfo-update command to the client list manager and ack the
segment when done.

Not tested, as there's interaction with the command channel and threads
and external modules. Too much plumbing and too little functionality to
test.

It'll be needed to watch over the descriptor. Added one from the real
server, and added a trick to provide one automatically in the tests.

data_source.h is now effectively empty so was removed.

without this we can't catch the case where zonemgr isn't running timely.
a unit test is updated to check that condition, too.

the behavior itself is the same, but it suppresses noise level in case
it's intentional configuration.  descriptions of other log messages in
this method were not really correct, so they were fixed, too.

also, it now asserts xfrin_session_ is non null; this should never be null
in the production code (even tests don't set it to null right now).

also improved in-auth and not-auth cases of logs with the sender endpoint
information.

This reverts commit c2165222.

Conflicts:
	src/bin/auth/statistics.cc.pre
	src/bin/auth/statistics.h
	src/bin/auth/tests/statistics_unittest.cc.pre

- add comments about hardcoded class default
- removed AuthSrv::loadZone() again
- more data integrity checks in datasrc clients mgr loadZone handler