Fix CSID5 to use LOOKUP of file

Some servers test CurrentFH valid for an operation before testing
stateid. For this test we do:

OPEN(name), LOOKUP(name), CLOSE

Now the CurrentFH at point of CLOSE is a regular file FH but the
process of LOOKUP has wiped out the Current Stateid.

Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>
Add CSID10 OPEN(name), SAVEFH, LOOKUP(name), RESTOREFH, CLOSE

This tests that SAVEFH does indeed save the Current Stateid and that
RESTOREFH restores it.

Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>