common: remove usage of set_daemon_default for now

common: remove usage of set_daemon_default for now

The code in common_preinit is still there to override
these settings as appropriate.

The set_daemon_default stuff was breaking ceph-conf tests (because
you would get the client-side defaults when asking about an OSD's
settings), and md_config_t isn't properly identifying daemons
using code_env yet.

Ticket to add it back in:
http://tracker.ceph.com/issues/20627

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