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/ui/knotty.py

@@ -144,7 +144,7 @@ class TerminalFilter(object):
                 pass
         if not cr:
             try:
-                cr = (env['LINES'], env['COLUMNS'])
+                cr = (os.environ['LINES'], os.environ['COLUMNS'])
             except:
                 cr = (25, 80)
         return cr