ft: higher level meta-mdonly put
ft: higher level meta-mdonly put

This adds the meta-mdonly header check from the client libary to a higher order
function. This allows metadata only puts to all backends types.

scality/S3,scality/S3,scality/S3,scality/S3,scality/S3,scality/S3,scality/S3,scality/S3