Add some more debug to cache_inode_readdir.c

Signed-off-by: Frank S. Filz <ffilzlnx@mindspring.com>
Add fsal_private to req_op_context

This is a void * that allows the FSAL to attach private data to the current
request.

This is useful when the FSAL calls back to cache_inode and is then
subsequently called again.

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

FSAL_PSEUDO will be used to implement the PseudoFS segments.

It will support multiple PseudoFS segments (file systems).

For a PseudoFS segment at "/", it will generate the same handles that
Ganesha 1.5 and 2.0 generate for PseudoFS.

This FSAL does not support any files other than directories.

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