MFC: r316717

MFC: r316717
During a server crash recovery, fix the NFSv4.1 client for a NFSERR_BADSESSION
during recovery.

If the NFSv4.1 client gets a NFSv4.1 NFSERR_BADSESSION reply to an Open/Lock
operation while recovering from the server crash/reboot, allow the opens
to be retained for a subsequent recovery attempt. Since NFSv4.1 servers
should only reply NFSERR_BADSESSION after a crash/reboot that has lost
state, this case should almost never happen.
However, for the AmazonEFS file service, this has been observed when
the client does a fresh TCP connection for RPCs.

git-svn-id: svn://svn.freebsd.org/base/stable/10@317474 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f