Get object attributes in GPFSFSAL_mknode()

A bunch of pynfs tests fail as it currently gives out parent directory
attributes rather than the actual object attributes!

Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Merge branch 'tp/access.cleanup' into ibm_next_20_tmp
Merge branch 'tp/gpfs.mknode' into ibm_next_20_tmp