Merge pull request #15413 from tchaikov/wip-rgw-boost-cleanup

rgw: drop asio/{yield,coroutine}.hpp replacements

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

diff --cc CMakeLists.txt
Simple merge

diff --cc src/include/config-h.in.cmake
Simple merge

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