bitbake: utils: Fix movefile() exception handling with python3

* with python3 this fails with:
  File: 'bitbake/lib/bb/utils.py', lineno: 799, function: movefile
       0795:        try:
       0796:            os.rename(src, destpath)
       0797:            renamefailed = 0
       0798:        except Exception as e:
   *** 0799:            if e[0] != errno.EXDEV:
       0800:                # Some random error.
       0801:                print("movefile: Failed to move", src, "to", dest, e)
       0802:                return None
       0803:            # Invalid cross-device-link 'bind' mounted or actually Cross-Device
  Exception: TypeError: 'OSError' object is not subscriptable

(Bitbake rev: 9f92322fa8d6f1a68c0c3f4984afdf65126b51dc)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/utils.py

@@ -796,7 +796,7 @@ def movefile(src, dest, newmtime = None, sstat = None):
             os.rename(src, destpath)
             renamefailed = 0
         except Exception as e:
-            if e[0] != errno.EXDEV:
+            if e.errno != errno.EXDEV:
                 # Some random error.
                 print("movefile: Failed to move", src, "to", dest, e)
                 return None