Fix Windows support

With a single line change, we can use this cinder client extension
on Windows. This patch will avoid the os.getuid call, which is
unavailable on Windows.

Note that on Windows, we aren't doing any privilege escalation,
assuming that we already have the required rights.

Here's a sample: http://paste.openstack.org/raw/802466/

Change-Id: Ic554b5df2adee38b97665c578ca69b33c8694ca7

README.rst

@@ -30,7 +30,7 @@ Optional dependencies based on Cinder driver's protocol::
 
 * open-iscsi, udev - for volume attachment via iSCSI
 
-NOTE (e0ne): current version is tested only on Linux hosts
+NOTE (e0ne): current version is tested on Linux and Windows hosts
 
 For any other information, refer to the parent projects, Cinder and
 python-cinderclient::

brick_cinderclient_ext/brick_utils.py

@@ -62,7 +62,7 @@ def get_root_helper():
 
 def require_root(f):
     def wrapper(*args, **kwargs):
-        if os.getuid() != 0:
+        if hasattr(os, 'getuid') and os.getuid() != 0:
             raise exceptions.CommandError(
                 "This command requires root permissions.")
         return f(*args, **kwargs)

releasenotes/notes/windows-support-c12b7b922aa43272.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    Added Windows support.