bitbake: toaster: use items and range instead of old APIs

Used items() and range() APIs instead of iteritems() and
xrange() as latter don't exist in python 3

[YOCTO #9584]

(Bitbake rev: 372dd3abcb201bd9ac2c3189c5505d3578ce0dd0)

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

bitbake/lib/toaster/toastergui/views.py

@@ -2279,7 +2279,7 @@ if True:
         # Strip trailing/leading whitespace from all values
         # put into a new dict because POST one is immutable
         post_data = dict()
-        for key,val in request.POST.iteritems():
+        for key,val in request.POST.items():
           post_data[key] = val.strip()