Merge pull request #52933 from dang/wip-dang-posix-driver

RGW - Add POSIX Driver

Reviewed-by: Casey Bodley <cbodley@redhat.com>
Reviewed-by: Matt Benjamin <mbenjamin@redhat.com>

diff --cc CMakeLists.txt
Simple merge

diff --cc ceph.spec.in
Simple merge

diff --cc src/rgw/CMakeLists.txt
Simple merge

diff --cc src/rgw/rgw_op.cc
Simple merge

diff --cc src/rgw/rgw_rest_s3.cc
Simple merge

diff --cc src/rgw/rgw_sal.cc
Simple merge