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/fetch2/ssh.py

@@ -114,12 +114,10 @@ class SSH(FetchMethod):
             fr = host
         fr += ':%s' % path
 
-
-        import commands
         cmd = 'scp -B -r %s %s %s/' % (
             portarg,
-            commands.mkarg(fr),
-            commands.mkarg(dldir)
+            fr,
+            dldir
         )
 
         bb.fetch2.check_network_access(d, cmd, urldata.url)