vfs: chimera: translate exceptions to nfs errors

chimera's move may throw several exceptions. We
need to convert them into corresponding nfs status code

Acked-by: Paul Millar
Target: master, 0.7, 0.6
(cherry picked from commit 9c342a96b56b0f9c5cff19a50e85da9b5c1698bf)
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>