Fix lint in glue.pipeline
This MR fixes the following lint in glue.pipeline
:
/builds/duncanmmacleod/glue/glue/pipeline.py:34:1: F401 'six.moves.urllib' imported but unused
/builds/duncanmmacleod/glue/glue/pipeline.py:36:1: F401 'socket' imported but unused
/builds/duncanmmacleod/glue/glue/pipeline.py:44:3: F401 'json.loads as decode' imported but unused
/builds/duncanmmacleod/glue/glue/pipeline.py:47:3: F401 'six.moves.http_client' imported but unused
/builds/duncanmmacleod/glue/glue/pipeline.py:1837:12: F821 undefined name 'cmp'
/builds/duncanmmacleod/glue/glue/pipeline.py:2183:5: F841 local variable 'length1' is assigned to but never used
/builds/duncanmmacleod/glue/glue/pipeline.py:2184:5: F841 local variable 'length2' is assigned to but never used
/builds/duncanmmacleod/glue/glue/pipeline.py:2345:40: F821 undefined name 'ostart'
/builds/duncanmmacleod/glue/glue/pipeline.py:2345:59: F821 undefined name 'ostart'
/builds/duncanmmacleod/glue/glue/pipeline.py:2399:5: F841 local variable 'length' is assigned to but never used