NFSv4.1/pnfs: Don't prevent layoutgets when doing return-on-close
NFSv4.1/pnfs: Don't prevent layoutgets when doing return-on-close

If there is an outstanding return-on-close, then we just want new
layoutget requests to wait rather than fail.

Signed-off-by: Trond Myklebust <cc958843532c615cbd4920e868f78c7985331a5a@primarydata.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs