bitbake: lib: fix most undefined code picked up by pylint

Correctly import, and inherit functions, and variables.
Also fix some typos and remove some Python 2 code that isn't recognised.

(Bitbake rev: b0c807be5c2170c9481c1a04d4c11972135d7dc5)

Signed-off-by: Frazer Clews <frazerleslieclews@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/fetch2/osc.py

@@ -8,12 +8,15 @@ Based on the svn "Fetch" implementation.
 """
 
 import logging
+import os
 import  bb
 from    bb.fetch2 import FetchMethod
 from    bb.fetch2 import FetchError
 from    bb.fetch2 import MissingParameterError
 from    bb.fetch2 import runfetchcmd
 
+logger = logging.getLogger(__name__)
+
 class Osc(FetchMethod):
     """Class to fetch a module or modules from Opensuse build server
        repositories."""