Making salt.wheel.pillar_roots python3 compatible

salt/wheel/pillar_roots.py

@@ -3,6 +3,7 @@
 The `pillar_roots` wheel module is used to manage files under the pillar roots
 directories on the master server.
 '''
+from __future__ import absolute_import
 
 # Import python libs
 import os
@@ -107,7 +108,7 @@ def read(path, saltenv='base', env=None):
     ret = []
     files = find(path, saltenv)
     for fn_ in files:
-        full = fn_.iterkeys().next()
+        full = next(fn_.iterkeys())
         form = fn_[full]
         if form == 'txt':
             with salt.utils.fopen(full, 'rb') as fp_: