Merge pull request #16385 from mikulely/3-check-target-when-create-bucket

rgw: check placement existence when create bucket

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

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

diff --cc src/rgw/rgw_common.h
Simple merge

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

diff --cc src/rgw/rgw_rados.h
Simple merge