scripts: Fix deprecated dict methods for python3

Replaced iteritems -> items, itervalues -> values,
iterkeys -> keys or 'in'

(From OE-Core rev: 25d4d8274bac696a484f83d7f3ada778cf95f4d0)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/pythondeps

@@ -187,7 +187,7 @@ def get_depends_recursive(directory):
     directory = os.path.realpath(directory)
 
     provides = dict((v, k) for k, v in get_provides(directory))
-    for filename, provide in provides.iteritems():
+    for filename, provide in provides.items():
         if os.path.isdir(filename):
             filename = os.path.join(filename, '__init__.py')
             ispkg = True