Merge pull request #11647 from ceph/wip-jlayton-cephfs

libcephfs client API overhaul and update

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

diff --cc ceph.spec.in
Simple merge

diff --cc debian/control
Simple merge

diff --cc debian/rules
Simple merge

diff --cc src/CMakeLists.txt
Simple merge

diff --cc src/client/Client.cc
Simple merge