Description of problem:

Steps to Reproduce:
[root@vm0 libgfapi-python]# python
Python 2.7.5 (default, Jun 25 2014, 10:19:55) 
[GCC 4.8.2 20131212 (Red Hat 4.8.2-7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from glusterfs import gfapi
>>> v = gfapi.Volume("vm0", "test")
>>> v.mount()
0
>>> v.stat('/a')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "glusterfs/gfapi.py", line 558, in stat
    raise OSError(err, os.strerror(err))
OSError: [Errno 0] Success
>>> 

Expected results:
Proper errno to be set. In the above example errno to be ENOENT.

Some additional info: