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@benkrikler : sorry for the delay and thanks for submitting the PR!

In general it is a very nice enhancement for our Python bindings.

However, I noticed while testing your PR that if the path contains a component that does not exist following exception is being raised:
```
Traceback (most recent call last):
  File "test.py", line 6, in <module>
    print glob.glob( 'root://slc7-test//tmp/dir3/file*' )
  File "/home/simonm/xrootd/build/bindings/python/build/lib.linux-x86_64-2.7/XRootD/glob.py", line 59, in glob
    return xrootd_glob(pathname)
  File "/home/simonm/xrootd/build/bindings/python/build/lib.linux-x86_64-2.7/XRootD/glob.py", line 80, in xrootd_glob
    for entry in dirlist.dirlist:
AttributeError: 'NoneType' object has no attribute 'dirlist'
```

same happen when I try to glob elements of directory that has not been exported on the XRootD server, e.g. for a server where only `/tmp` is exported try:

`glob.glob( 'root://hostname//*' )`

Could you improve error handling?

Thanks, 
Michal

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