bitbake: bitbake: Convert to python 3

Various misc changes to convert bitbake to python3 which don't warrant
separation into separate commits.

(Bitbake rev: d0f904d407f57998419bd9c305ce53e5eaa36b24)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/cache.py

@@ -28,21 +28,15 @@
 # with this program; if not, write to the Free Software Foundation, Inc.,
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-
 import os
+import sys
 import logging
+import pickle
 from collections import defaultdict
 import bb.utils
 
 logger = logging.getLogger("BitBake.Cache")
 
-try:
-    import cPickle as pickle
-except ImportError:
-    import pickle
-    logger.info("Importing cPickle failed. "
-                "Falling back to a very slow implementation.")
-
 __cache_version__ = "150"
 
 def getCacheFile(path, filename, data_hash):
@@ -80,7 +74,7 @@ class RecipeInfoCommon(object):
         out_dict = dict((var, metadata.getVarFlag(var, flag, True))
                     for var in varlist)
         if squash:
-            return dict((k,v) for (k,v) in out_dict.iteritems() if v)
+            return dict((k,v) for (k,v) in out_dict.items() if v)
         else:
             return out_dict
 
@@ -240,7 +234,7 @@ class CoreRecipeInfo(RecipeInfoCommon):
         cachedata.universe_target.append(self.pn)
 
         cachedata.hashfn[fn] = self.hashfilename
-        for task, taskhash in self.basetaskhashes.iteritems():
+        for task, taskhash in self.basetaskhashes.items():
             identifier = '%s.%s' % (fn, task)
             cachedata.basetaskhash[identifier] = taskhash
 
@@ -404,7 +398,7 @@ class Cache(object):
         infos = []
         datastores = cls.load_bbfile(filename, appends, configdata)
         depends = []
-        for variant, data in sorted(datastores.iteritems(),
+        for variant, data in sorted(datastores.items(),
                                     key=lambda i: i[0],
                                     reverse=True):
             virtualfn = cls.realfn2virtual(filename, variant)
@@ -616,7 +610,7 @@ class Cache(object):
         pickler_dict['CoreRecipeInfo'].dump(bb.__version__)
 
         try:
-            for key, info_array in self.depends_cache.iteritems():
+            for key, info_array in self.depends_cache.items():
                 for info in info_array:
                     if isinstance(info, RecipeInfoCommon):
                         cache_class_name = info.__class__.__name__