mon: do not use CEPH_FEATURES_ALL for things that touch the disk

mon: do not use CEPH_FEATURES_ALL for things that touch the disk

We want to encode with our quorum_features instead. Remaining uses of
CEPH_FEATURES_ALL are:
1) when the Elector is sharing its supported features
2) in a MonMap function which is used by monmaptool
3) In the Monitor for winning a standalone election, for ephemeral data,
  and for doing mkfs (when we necessarily don't have quorum_features).
4) When doing ceph-mon --inject-monmap (we don't persist the quorum_features
  to disk, so we can't use them here).
5) in MMonElection, for doing the default monmap encoding (which is
  re-encoded later if the final features don't match CEPH_FEATURES_ALL).
6) As the default encode features for the OSDMap (the monitor always
  supplies quorum_features instead).

Signed-off-by: Greg Farnum <greg@inktank.com>