PNFS: no create_session on second file

when layoutget returns a different deviceid pointing to the same DS
PNFS: no read on same file if holding write delegation
POSIX: check size for file only on stat() functions
HOST: create data directory if it does not exist
PNFS: clear list of current device ids
PNFS: add debug message to display dataserver info
HOST: fix mount command, use vers instead of nfsvers

Also, remove 'intr' from the default options
POSIX: fix on test message to use string file type
POSIX: add debug message to log the error on open
POSIX: fix problem when O_DIRECTORY is use on symlink

Make sure to catch ENOTDIR or ELOOP properly
POSIX: correctly handle errors when using O_NOATIME
POSIX: using O_CREAT|O_DIRECTORY is unspecified
CONFIG: change version to 1.0.2