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now catch exceptions from reload().

note: I simply removed the last error case.  Such a broken config isn't
installed anyway, so checking after that doesn't seem to make much sense.

Fixed minor conflicts:
	src/bin/auth/datasrc_clients_mgr.h

update the test case and log message accordingly.

as discussed in the ticket comments

A few more checks in test
cleaned up added headers
reordered log message file

from AuthSrv:: (in auth_srv.h) to isc:datasrc:: (in client_list.h), the previous location wasn't really relevant now that it is used elsewhere, and this seemed the most logical location

also explicitly reject invalid command ID, which should be internal bug.

mainly for better readability.  no functional change.