crush/CrushWrapper: encode with features

crush/CrushWrapper: encode with features

No behavior change yet; just fixing callers.

Signed-off-by: Sage Weil <sage@redhat.com>
(cherry picked from commit b7c9e055848c8aa951bc48c957cff3ef323ea441)

[Updated write_file to use all feaetures]
[Updated OSDMonitor.cc to use mon->quorum_features instead of the
 mon->get_quorum_con_featuers() helper]
[trivial conflict from removed write_file and read_file]

Conflicts:
	src/crush/CrushWrapper.h
	src/mgr/PyModules.cc
	src/mon/OSDMonitor.cc
	src/tools/ceph_monstore_tool.cc